tests: add host zone with overlap
    
    This patch is mainly for test_forced_client_reenrolment suite
    where when we are not in control of our client DNS we create an
    overlap zone in order to get the host records updated. This also
    sets resolv.conf before every ipa-client-install to the ipa master.
    
    https://pagure.io/freeipa/issue/7124
    
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>
    Reviewed-By: Milan Kubik <mkubik@redhat.com>