Add golint to travis build
Add golint to travis build

Signed-off-by: Rohit Kumar <bf9db8c0f4342eaf27792a19d3daba493b5df7cd@pivotal.io>

pivotal-cf-experimental/opentsdb-firehose-nozzle,pivotal-cf-experimental/opentsdb-firehose-nozzle,evoila/influxdb-firehose-nozzle,CA-APM/epagent-nozzle,simonjohansson/datadog-firehose-nozzle,simonjohansson/datadog-firehose-nozzle,tmcgaughey/epagent-nozzle