fix the failure to parse req.swagger.query

[lanchongyizu]

The result of req.swagger.params as below is different than the original in https://github.com/RackHD/on-http/blob/master/lib/services/swagger-api-service.js.

  [mac:
   { path: [ 'paths', '/profiles', 'get', 'parameters', '2' ],
     schema:
      { description: 'When macs parameter is not passed, passed with IP adds MAC address to lookup',
        in: 'query',
        name: 'mac',
        required: false,
        type: 'string' },
     originalValue: undefined,
     value: undefined }]

@RackHD/corecommitters @iceiilin @pengz1