docs: def set_vswitch(self, switch_name, **kwargs):
          """Set vswitch"""
          smt_userid = zvmutils.get_smt_userid()
          rd = ' '.join((
              "SMAPI %s API Virtual_Network_Vswitch_Set_Extended" %
              smt_userid,
              "--operands",
              "-k switch_name=%s" % switch_name))
  
          for k, v in kwargs.items():
              rd = ' '.join((rd,
                             "-k %(key)s=\'%(value)s\'" %
                             {'key': k, 'value': v}))
  
          try:
              self._request(rd)
          except exception.SDKSMTRequestFailed as err:
              LOG.error("Failed to set vswitch %s, error: %s" %
                        (switch_name, err.format_message()))
              self._set_vswitch_exception(err, switch_name)