Azure: temporarily disable problematic tests, #2
    
    test_cert and test_SubCAkeyReplication are randomly failing.
    The suspect for test_SubCAkeyReplication is an nss bug:
    https://bugzilla.redhat.com/show_bug.cgi?id=1985061
    
    The reason for test_cert failures was not identified, the only
    relevant line in the log contains:
    2021-07-22T17:37:21.0873339Z tests: cert, result: 1, time: 30:08.98
    2021-07-22T17:37:21.0874172Z Command exited with non-zero status 1
    
    Disable these tests in gating until the NSS bug is fixed and
    the related build is available in Fedora.
    
    Related: https://pagure.io/freeipa/issue/8864
    Signed-off-by: François Cami <fcami@redhat.com>
    Reviewed-By: Michal Polovka <mpolovka@redhat.com>
    Reviewed-By: Stanislav Levin <slev@altlinux.org>