Upgrade from 5.0-rc3 to 5.0-rc4.

<ChangeLog>

Upgrade urgency

HIGH: Many non critical but important issues fixed.
CRITICAL for Stream users: Many important bugs fixed.

Fixes:

* A number of fixes related to Streams: stability and correctnes.
* Fix dbRandomKey() potential infinite loop.
* Improve eviction LFU/LRU when keys are created by INCR commands family.
* Active defragmentation is now working on Redis 5.
* Fix corner case in Redis CLuster / Sentinel failover, by resetting the
  disconnection time with master in a more appropriate place.
* Use a private version of localtime() to avoid potential deadlocks.
* Different redis-cli non critical fixes.
* Fix rare replication stream corruption with disk-based replication.

Improvements:

* Sentinel: add an option to deny online script reconfiguration.
* Improved RESTORE command.
* Sentinel command renaming: allows to use Sentinel with Redis instances
  that have non standard command names.
* CLIENT ID and CLIENT UNBLOCK.
* CLIENT LIST now supports a TYPE option.
* redis-cli --cluster now supports authentication.
* redis-trib is now deprecated (use redis-cli --cluster).
* Better slaves output buffers efficiency.
* Faster INFO when there are many clients connected.
* Dynamic HZ feature.
* Improvements in what the MEMORY command is able to report.
* Add year in log. (WARNING: may be incompatible with log scraping tools)
* Lazy freeing now works even when values are overwritten (for instance SET).
* Faster ZADD when elements scores are updated.
* Improvements to the test suite, including many new options.

</ChangeLog>

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