Add more error checking for mctimings
Add more error checking for mctimings

Change-Id: I96a85310bd48180c03919cdc398d2bbd8a27321c
Reviewed-on: http://review.couchbase.org/35935
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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