'Add the port'

def add(self):

    cmd = ['add-port', self.bridge, self.port]
    if self.tag:
        cmd += [('tag=' + self.tag)]
    if (self.set and self.set_opt):
        cmd += ['--', 'set']
        cmd += self.set_opt.split('    ')
    (rtc, _, err) = self._vsctl(cmd)
    if (rtc != 0):
        self.module.fail_json(msg=err)
    return True
