Add SIGINT handler to cli --intrinsic-latency
Add SIGINT handler to cli --intrinsic-latency

If we run a long latency session and want to Ctrl-C out of it,
it's nice to still get the summary output at the end.

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