MB-32880: Add durableWrite to bucket capabilities.

Change-Id: Ic8e00dd9901ff4ff6312af59f8d8606e6d0bfeda
Reviewed-on: http://review.couchbase.org/105943
Reviewed-by: Dave Rigby <daver@couchbase.com>
Well-Formed: Build Bot <build@couchbase.com>
Tested-by: Build Bot <build@couchbase.com>
Reviewed-by: Aliaksey Artamonau <aliaksey.artamonau@couchbase.com>

src/menelaus_web_buckets.erl

@@ -406,7 +406,8 @@ build_bucket_capabilities(BucketConfig) ->
     MoreCaps =
         [C || {C, true} <-
                   [{xattr, cluster_compat_mode:is_cluster_50()},
-                   {collections, collections:enabled(BucketConfig)}]],
+                   {collections, collections:enabled(BucketConfig)},
+                   {durableWrite, cluster_compat_mode:is_cluster_madhatter()}]],
 
     Caps =
         case ns_bucket:bucket_type(BucketConfig) of