Tests for backup-restore when pkg required is missing
    
    Tests for ipa-restore behaviour when dns or adtrust
    rpm is missing which is required during ipa-restore
    
    https://pagure.io/freeipa/issue/7630
    
    Signed-off-by: Kaleemullah Siddiqui <ksiddiqu@redhat.com>
    Reviewed-By: Florence Blanc-Renaud <flo@redhat.com>