MB-46980: show "delete group" if user has write permission

Change-Id: I03e36df0882c13c030d9510770b209b29716a3a2
Reviewed-on: http://review.couchbase.org/c/ns_server/+/159013
Well-Formed: Build Bot <[email protected]>
Tested-by: Pavel Blagodov <[email protected]>
Reviewed-by: Pavel Blagodov <[email protected]>
Reviewed-by: Matthew <[email protected]>

Author: pavel-blagodov

priv/public/ui/app/mn_admin/mn_groups.html

@@ -114,6 +114,7 @@ <h4 class="ellipsis">{{group.name}}&nbsp;
       This group is empty.
       <a
          ng-click="groupsCtl.deleteGroup(group)"
+         ng-show="rbac.cluster.server_groups.write"
          class="indent-1">
         delete group
       </a>