Fixing tests on TestReplicaManageDel
    
    This commit fixes the tests on class TestReplicaManageDel:
    - test_replica_managed_del_domlevel1
    - test_clean_dangling_ruv_multi_ca
    - test_replica_managed_del_domlevel0
    
    Given that domain level 0 doest not have autodiscovery, we need to
    configure /etc/resolv.conf with the master data (search <domain> and
    nameserver <master_ip>) in order to ipa-replica-install succeed.
    
    Reviewed-By: Rob Crittenden <rcritten@redhat.com>