Make checks for "MAC verified OK" message optional
    
    When verifying PKCS#12 bundles, don't expect a "MAC verified OK" message
    with the MAC is verified, since newer versions of OpenSSL's pkcs12
    command don't print the message.  They still print an error if
    verification fails, so strip the verification message from the expected
    results to accept the output from older versions.
    
    Signed-off-by: Nalin Dahyabhai <nalin@redhat.com>