Build a systemctl command line. Treat unit names without one
    of the valid suffixes as a service.

def _systemctl_cmd(action, name=None, systemd_scope=False, no_block=False,
                   root=None):
    '''
    Build a systemctl command line. Treat unit names without one
    of the valid suffixes as a service.
    '''
    ret = []
    if systemd_scope \
            and salt.utils.systemd.has_scope(__context__) \
            and __salt__['config.get']('systemd.scope', True):
        ret.extend(['systemd-run', '--scope'])
    ret.append('systemctl')
    if no_block:
        ret.append('--no-block')
    if root:
        ret.extend(['--root', root])
    if isinstance(action, six.string_types):
        action = shlex.split(action)
    ret.extend(action)
    if name is not None:
        ret.append(_canonical_unit_name(name))
    if 'status' in ret:
        ret.extend(['-n', '0'])
    return ret