Add missing parameters to processor adapters

[jahvi]

The GraphQL endpoint is not setting the required req and res parameters in the processor adapter so queries to the products query are throwing the following error:

Entering ProductProcessor::process
Taxes will be calculated for GB  false
Elasticsearch INFO: 2019-04-17T18:25:22Z
  Adding connection to http://localhost:9200/

Elasticsearch DEBUG: 2019-04-17T18:25:22Z
  starting request {
    "method": "POST",
    "path": "/vue_storefront_magento_1/taxrule/_search",
    "body": {},
    "query": {}
  }


Elasticsearch DEBUG: 2019-04-17T18:25:22Z
  Request complete

TypeError: Cannot read property 'query' of undefined
    at ProductProcessor.<anonymous> (/Users/jahvi/Repositories/vue-storefront-api/src/processor/product.js:33:21)