lazyfree & eviction: record latency generated by lazyfree eviction
lazyfree & eviction: record latency generated by lazyfree eviction

1. add eviction-lazyfree monitor
2. put eviction-del & eviction-lazyfree into eviction-cycle
   that means eviction-cycle contains all the latency in
   the eviction cycle including del and lazyfree
3. use getMaxmemoryState to check if we can break in lazyfree-evict

pmem/redis,pmem/redis,pmem/redis,pmem/redis