In case of running mariadb role with --limit the group_by module will only include the limited hosts and other hosts that are not limited by ansible will not be included.
Using add_host will add all hosts in mariadb group to their shards group
Signed-off-by: Seena Fallah <seenafallah@gmail.com>
Change-Id: I1331698e313bd714a16fc35f38fb579d75b56370
Closes-Bug: #1947589