Fix merge of cluster migrate-to flag.
Fix merge of cluster migrate-to flag.

splitice/redis,maodeyi/redis_lua,slfs007/mk-redis,ramonsnir/redis,ramonsnir/redis,louisliangjun/redis,ramonsnir/redis,louisliangjun/redis,maodeyi/redis_lua,splitice/redis,splitice/redis,louisliangjun/redis,louisliangjun/redis,maodeyi/redis_lua,splitice/redis,slfs007/mk-redis,slfs007/mk-redis