Comment set_env_var

Cause:
Failed to execute: 'control start' for
/var/lib/openshift/54557263500446575c000120/newrelic-agent
/usr/lib/openshift/cartridge_sdk/bash/sdk: line 154:
/var/lib/openshift/54557263500446575c000120/newrelic-agent/env/JAVA_OPTS_EXT:
Permission denied