Fix managing winsync replication agreements with ipa-replica-manage
force-sync, re-initialize and del were not working because they
all attempted to contact the AD server. winsync agreements are
managed on the local 389-ds instance.
This also:
- requires root to create winsync agreement (for updating NSS db)
- fixes filter in get_replication_agreement() to work with winsync
https://fedorahosted.org/freeipa/ticket/2128