Commands refactor, first pass.

- add API versionning
- changed error handling, based on exception
- commands moved/merged from mod_admin_p1 to mod_admin_extra
- command bufixes
- add some elixir unit test cases

Squashed commit of the following:

commit dd59855b3486f78a9349756e4f102e79b3accff8
Merge: 14e8ffc 506e08e
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Fri Oct 30 11:43:18 2015 +0100

    Merge branch '3.2.x' into api

commit 14e8ffce78cbea6c8605371d1fc50a0c1d1e012c
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Tue Oct 27 16:35:17 2015 +0100

    Added OAuth tests to ejabberd_commands

commit f81c550c14628edfe4861c228576cb767924366a
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Tue Oct 27 16:34:55 2015 +0100

    Added some mod_http_api tests

commit 6a64578d5b2ba532a2feb6503ed98561e56d5d53
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Mon Oct 26 15:29:36 2015 +0100

    Fix get_last command test

    Previous version won't work with dst.

commit 27e0cde9e9c1f001effe68f8424a365ad947c068
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Fri Oct 23 17:59:34 2015 +0200

    Add tests on admin command policy

commit 19dad8d54f54c9fabd454280483cccfb06c8e78a
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Fri Oct 23 16:49:36 2015 +0200

    Added command related tests (http api & user policy)

commit e0e596ab4a3f3a70aba5f374f028939ab794de33
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Fri Oct 23 16:49:16 2015 +0200

    Fix command call.

commit 128cd7d1ede3c47a34f8ec3a750c980ccad2c61d
Merge: 60c4c4c 447313c
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Thu Oct 22 14:48:39 2015 +0200

    Merge branch '3.2.x' into api

commit 60c4c4c0751302524c14219c6bc8c56a6069a689
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Thu Oct 22 14:45:57 2015 +0200

    Fix ejabberd_commands spec.

commit 8e145c28c5da762c2b93ee32327eff1db94ebfed
Merge: 397273a f13dc94
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Wed Oct 21 18:26:07 2015 +0200

    Merge branch '3.2.x' into api

commit 397273a23ed415feac87aed33da6452229793387
Merge: c30e89b f289e27
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Wed Oct 21 15:27:45 2015 +0200

    Merge branch '3.2.x' into api

commit c30e89bb8a0013bff37e61e4c6953350c9c1f313
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Wed Oct 21 12:47:02 2015 +0200

    Merge mod_http_api

commit 7b0db22b4acd48ff6fabce41c1b2525e6580a3c5
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Fri Oct 16 11:55:48 2015 +0200

    Fix exunit tests to run with common_test suites

commit d8b1a89800ac7379a57a7eb4a09c3c93c3e1e5eb
Merge: 2879ae8 63455b3
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Thu Oct 15 11:39:45 2015 +0200

    Merge branch '3.2.x' into api

commit 2879ae87ff3eee369ef3d780136b96ecff5285d1
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Wed Oct 14 14:53:44 2015 +0200

    Fix update_roster command.

commit a1d453dd7a3afda9861a8d747494a45057ad574b
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Tue Oct 13 16:14:28 2015 +0200

    API commands refactor

    Moving and/or merging commands from mod_admin_p1 to mod_admin_extra

commit b709ed26b0fc0ca4f3bdd5a59fa58ec7e3db97fa
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Wed Oct 7 15:10:01 2015 +0200

    Add tests on commands

commit 6711687bee9c672cb3d5aed0744e13420ecf6dbd
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Tue Sep 29 15:58:16 2015 +0200

    Add ejabberd_commands tests

commit df8682f419cf3877e77e36a19bca0fc55dc991f8
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Mon Sep 28 14:54:39 2015 +0200

    Added API versioning for ejabberdctl and rest commands

commit cd017b0e3aac431bc3ee807ceb7f8641e1523ef5
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Fri Sep 18 11:21:45 2015 +0200

    Better error handling of HTTP API commands.

commit ca5cb6acd8e4643f9d6c484d2277b0d7e88471e5
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Tue Sep 15 15:03:05 2015 +0200

    add commands to mod_admin_extra:
    - get_offline_count
    - get_presence
    - change_password

commit 7f583fa099e30ac2b0915669fd8f102ac565b833
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Tue Sep 15 15:02:16 2015 +0200

    Improve REST API error handling

commit 14753b1c02cdce434a786b7f80f6c09f0d210075
Author: Jerome Sautret <jerome.sautret@process-one.net>
Date:   Mon Sep 14 10:51:17 2015 +0200

    Change REST API return codes for integer type.

1 files changed, 106 insertions, 0 deletions

diff --git a/test/ejabberd_sm_mock.exs b/test/ejabberd_sm_mock.exs
new file mode 100644
index 000000000..0c2fc1635
--- /dev/null
+++ b/test/ejabberd_sm_mock.exs
@@ -0,0 +1,106 @@
+	#  ejabberd_sm mock
+	######################
+
+defmodule EjabberdSmMock do
+  @author "jsautret@process-one.net"
+
+	require Record
+	Record.defrecord :session, Record.extract(:session,
+																						from: "ejabberd_sm.hrl")
+	Record.defrecord :jid, Record.extract(:jid,
+																				from: "jlib.hrl")
+	
+	@agent __MODULE__
+
+	def init do
+		ModLastMock.init
+
+		try do
+			Agent.stop(@agent)
+    catch
+      :exit, _e -> :ok
+    end
+		
+		{:ok, _pid} = Agent.start_link(fn -> [] end, name: @agent)
+		
+    mock(:ejabberd_sm, :get_user_resources,
+			fn (user, domain)  -> for s <- get_sessions(user, domain), do: s.resource end)
+
+    mock(:ejabberd_sm, :route,
+			fn (_from, to, {:broadcast, {:exit, _reason}})  ->
+				user = jid(to, :user)
+				domain = jid(to, :server)
+				resource = jid(to, :resource)
+				disconnect_resource(user, domain, resource)
+				:ok
+				(_, _, _) -> :ok
+			end)
+		
+	end
+	
+	def connect_resource(user, domain, resource,
+											 opts \\ [priority: 1, conn: :c2s]) do
+		Agent.update(@agent, fn sessions ->
+			session = %{user: user, domain: domain, resource: resource,
+									timestamp: :os.timestamp, pid: self, node: node,
+									auth_module: :ejabberd_auth, ip: :undefined,
+									priority: opts[:priority], conn: opts[:conn]}
+			[session | sessions]
+		end)
+	end
+
+	def disconnect_resource(user, domain, resource) do
+		disconnect_resource(user, domain, resource, ModLastMock.now)
+	end
+
+	def disconnect_resource(user, domain, resource, timestamp) do
+		Agent.update(@agent, fn sessions ->					
+		for s <- sessions,
+			s.user != user or s.domain != domain or s.resource != resource, do: s
+		end)
+		ModLastMock.set_last user, domain, "", timestamp
+	end
+	
+	def get_sessions() do
+		Agent.get(@agent, fn sessions -> sessions end)
+	end
+
+	def get_sessions(user, domain) do
+		Agent.get(@agent, fn sessions ->
+		for s <- sessions, s.user == user, s.domain == domain, do: s
+		end)
+	end
+
+	def get_session(user, domain, resource) do
+		Agent.get(@agent, fn sessions ->
+		for s <- sessions,
+			s.user == user, s.domain == domain,	s.resource == resource, do: s
+		end)
+	end
+	
+	def to_record(s) do
+		session(usr: {s.user, s.domain, s.ressource},
+						us: {s.user, s.domain},
+						sid: {s.timestamp, s.pid},
+						priority: s.priority,
+						info: [conn: s.conn, ip: s.ip, node: s.node,
+									 oor: false, auth_module: s.auth_module])
+	end
+
+	####################################################################
+	#     Helpers
+	####################################################################
+
+	
+  # TODO refactor: Move to ejabberd_test_mock
+  def mock(module, function, fun) do
+    try do
+      :meck.new(module)
+    catch
+      :error, {:already_started, _pid} -> :ok
+    end
+
+    :meck.expect(module, function, fun)
+  end
+
+end