Cluster test: when valgrind is enabled, use a larger node-timeout.
Cluster test: when valgrind is enabled, use a larger node-timeout.

Removes some percentage of timing related failures.

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