Added a quiet mode to engine_testapp.
Added a quiet mode to engine_testapp.

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