https://bugzilla.redhat.com/show_bug.cgi?id=625424
https://bugzilla.redhat.com/attachment.cgi?id=480602&action=diff
https://bugzilla.redhat.com/attachment.cgi?id=480602&action=edit
Description: repl-monitor.pl has been designed to display the
entire replication topology. This patch allows to show the
subset of the topology starting from the specified hub.