Make do_request's params payload generic
Make do_request's params payload generic

do_json_request should handle encoding params to json, not do_request

this means we can then send multipart post requests with do_request

theodi/gds-api-adapters,bitzesty/gds-api-adapters,alphagov/gds-api-adapters,bitzesty/gds-api-adapters,theodi/gds-api-adapters