Remove custom install step in travis ci config yml
Remove custom install step in travis ci config yml

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

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