Remove unused member: supports_datatype
Remove unused member: supports_datatype

Change-Id: I9df89660bc27896b8d4bb0858ce07b21549397e7
Reviewed-on: http://review.couchbase.org/84863
Tested-by: Build Bot <80754af91bfb6d1073585b046fe0a474ce868509@couchbase.com>
Reviewed-by: Dave Rigby <a09264da4832c7ff1d3bf1608a19f4b870f93750@couchbase.com>

daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine,daverigby/kv_engine