Drop test_sudo
    
    We now test full highstates for each role, hence individual testing
    of the sudo states is no longer needed.
    The visudo configuration validation is taken care of by the check
    commands implemented in the sudoers formula states, which are
    executed as part of test_highstate.
    
    Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>