ipatests: add test for ipa-restore in multi-master configuration
    
    Test ensures that after ipa-restore on the master, the replica can be
    re-synchronized and a new replica can be created.
    
    https://pagure.io/freeipa/issue/7455
    
    Reviewed-By: Christian Heimes <cheimes@redhat.com>
    Reviewed-By: Tibor Dudlak <tdudlak@redhat.com>