redis-benchmark: update help for new __rand_int__ form.
Deprecate utils/redis-copy.rb in favor of redis-copy gem
Merge pull request #1366 from yaauie/deprecate-redis-copy-script-in-2.6

2.6 branch backport of #1365
Fix broken rdbWriteRaw() return value check in rdb.c.

Thanks to @PhoneLi for reporting.
Log to what master a slave is going to connect to.
Merge remote-tracking branch 'upstream/2.6' into luajit
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