MB-48275 Allow back role access to n1ql metadata

Prior to this change in order to backup/restore n1ql metadata a user
needed to have both the data_backup and query_system_catalog roles. With
this change only data_backup is needed.

curl -u backupUser:asdasd localhost:9000/pools/default/checkPermissions \
         -d 'cluster.bucket[travel-sample].n1ql.meta!backup'
{"cluster.bucket[travel-sample].n1ql.meta!backup":true}

Change-Id: I004ef72533afce13b72cc3d85c241bc3b7861ee6
Reviewed-on: http://review.couchbase.org/c/ns_server/+/160666
Well-Formed: Restriction Checker
Well-Formed: Build Bot <[email protected]>
Tested-by: Steve Watanabe <[email protected]>
Tested-by: Build Bot <[email protected]>
Reviewed-by: Artem Stemkovski <[email protected]>

Author: stevewatanabe

src/menelaus_roles.erl

@@ -325,6 +325,7 @@ roles() ->
        {[{bucket, bucket_name}, stats], [read]},
        {[{bucket, bucket_name}, settings], [read]},
        {[{bucket, bucket_name}, n1ql, index], [create, list, build]},
+       {[{bucket, bucket_name}, n1ql, meta], [backup]},
        {[{bucket, bucket_name}, analytics], [manage, select]},
        {[analytics], [select, backup]},
        {[pools], [read]}]},