Support abstime in the mock server.
Support abstime in the mock server.

mrkwse/memcached,couchbase/memcached,mrkwse/memcached,abhinavdangeti/memcached,daverigby/kv_engine,owendCB/memcached,owendCB/memcached,daverigby/memcached,abhinavdangeti/memcached,jimwwalker/memcached,couchbase/memcached,owendCB/memcached,zbase/memcached,zbase/memcached,Metaswitch/memcached,daverigby/kv_engine,daverigby/memcached,daverigby/kv_engine,owendCB/memcached,Metaswitch/memcached,abhinavdangeti/memcached,cloudrain21/memcached-1,daverigby/memcached,cloudrain21/memcached-1,cloudrain21/memcached-1,jimwwalker/memcached,cloudrain21/memcached-1,jimwwalker/memcached,daverigby/kv_engine,mrkwse/memcached,couchbase/memcached,zbase/memcached,Metaswitch/memcached,Metaswitch/memcached,zbase/memcached,couchbase/memcached,mrkwse/memcached,daverigby/memcached,Metaswitch/memcached,abhinavdangeti/memcached,abhinavdangeti/memcached,zbase/memcached