Merge branch 'stable' into ft-new-ut

test/memcached/cfg/master.cfg

test/memcached/cfg/tarantool_memcached_bad.cfg

test/memcached/cfg/tarantool_memcached_off.cfg

test/memcached/off.test

test/memcached/suite.ini

test/replication/cfg/hot_standby.cfg

test/replication/cfg/master.cfg

test/replication/cfg/master_to_replica.cfg

test/replication/cfg/replica.cfg

test/replication/cfg/replica_to_master.cfg

test/replication/consistent.result

test/replication/memcached.result

test/replication/memcached.test