PFCOUNT multi-key test added.
PFCOUNT multi-key test added.

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