ipatests: install master with allow-zone-overlap
    
    In the IPA to IPA migration tests, install the destination master
    with --setup-dns --allow-zone-overlap to allow installation
    even if the zone is already served by the source master.
    
    Fixes: https://pagure.io/freeipa/issue/9697
    Signed-off-by: Florence Blanc-Renaud <flo@redhat.com>
    Reviewed-By: Sudhir Menon <sumenon@redhat.com>