Remove failing http test on 4.x/0.12
Remove failing http test on 4.x/0.12

keymetrics/trassingue,keymetrics/vxx,googleapis/cloud-trace-nodejs,matthewloring/cloud-trace-nodejs,matthewloring/cloud-trace-nodejs,ofrobots/cloud-trace-nodejs,ofrobots/cloud-trace-nodejs,matthewloring/cloud-trace-nodejs,keymetrics/trassingue,googleapis/cloud-trace-nodejs,googleapis/cloud-trace-nodejs,keymetrics/vxx,googleapis/cloud-trace-nodejs