Verify replication topology for a suffix
Checks done:
1. check if the topology is not disconnected. In other words if
there are replication paths between all servers.
2. check if servers don't have more than a recommended number of
replication agreements(4)
https://fedorahosted.org/freeipa/ticket/4302
Reviewed-By: David Kupka <dkupka@redhat.com>