MB-4928: Stats cachedump has binary support
MB-4928: Stats cachedump has binary support

We currently only support cachedump in ascii and we should
support it in binary as well. Also note that we no longer
support stats cachedump and return a NOT_SUPPORTED error
to the user so this change just makes sure that happens in
the binary protocol.

Change-Id: Ic51fef5c2869a28d46a4f128fbe1925bbf86aa20
Reviewed-on: http://review.couchbase.org/17025
Tested-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

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