prevent duplicate IDs when setting up multiple replicas against single master
This patch forces replicas to use DELETE+ADD operations to increment
'nsDS5ReplicaId' in 'cn=replication,cn=etc,$SUFFIX' on master, and retry
multiple times in the case of conflict with another update. Thus when multiple
replicas are set-up against single master none of them will have duplicate ID.
https://fedorahosted.org/freeipa/ticket/4378
Reviewed-By: Thierry Bordaz <tbordaz@redhat.com>