NCBC-344: NotImplementedException when storing against MemcachedClient in v1.3 client

Change-Id: Idb9160f3964a2a97aa845b382ce1ee21d02a07b1
Reviewed-on: http://review.couchbase.org/31039
Tested-by: Jeffry Morris <jeffrymorris@gmail.com>
Reviewed-by: Brett Lawson <brett19@gmail.com>