BinprotMutationCommand: Allow setting Greenstack::Datatype
BinprotMutationCommand: Allow setting Greenstack::Datatype

In addition to the raw PROTOCOL_BINARY_DATATYPE_ constant

Change-Id: Ie21ab9f59e069d15668f9027bd5086755c2a18ba
Reviewed-on: http://review.couchbase.org/72118
Tested-by: buildbot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Trond Norbye <60edd2ef23891a753f231b0c6f161dc634079a93@gmail.com>

couchbase/memcached,daverigby/memcached,daverigby/memcached,daverigby/kv_engine,daverigby/kv_engine,daverigby/memcached,daverigby/kv_engine,daverigby/kv_engine,couchbase/memcached,couchbase/memcached,daverigby/memcached,couchbase/memcached