Cluster: flush importing/migrating state when master is turned into slave.
Cluster: flush importing/migrating state when master is turned into slave.

Hailei/redis,spearhead-ea/redis,xuzhezhaozhao/redis_reading,Hailei/redis,MSOpenTech/redis,MSOpenTech/redis,ksarch-saas/redis,darksideofthemoo/redis-histogram,ttuna/msot-redis,splitice/redis,darksideofthemoo/redis-histogram,xuzhezhaozhao/redis_reading,Hailei/redis,maodeyi/redis_lua,jxwr/redis,maodeyi/redis_lua,spearhead-ea/redis,xuzhezhaozhao/redis_reading,ttuna/msot-redis,jxwr/redis,ttuna/msot-redis,splitice/redis,ramonsnir/redis,HunanTV/redis,spearhead-ea/redis,darksideofthemoo/redis-histogram,himoca/redis,louisliangjun/redis,Hailei/redis,maodeyi/redis_lua,MSOpenTech/redis,himoca/redis,ramonsnir/redis,louisliangjun/redis,MSOpenTech/redis,jxwr/redis,ramonsnir/redis,ttuna/msot-redis,HunanTV/redis,splitice/redis,louisliangjun/redis,ksarch-saas/redis,xuzhezhaozhao/redis_reading,slfs007/mk-redis,darksideofthemoo/redis-histogram,louisliangjun/redis,splitice/redis,HunanTV/redis,ksarch-saas/redis,slfs007/mk-redis,MSOpenTech/redis,HunanTV/redis,himoca/redis,ttuna/msot-redis,ksarch-saas/redis,slfs007/mk-redis