memcached_testapp: Add a '-v' option to enable verbose memcached output
memcached_testapp: Add a '-v' option to enable verbose memcached output

If '-v' is specified to memcached_testapp, disable the blackhole
logger (using default of stderr instead) and increase verbosity to 2.

Change-Id: Id14a1b76eb0159176dc0a497d211633e886e281d
Reviewed-on: http://review.couchbase.org/51332
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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