Support NEW_RELIC_LICENSE_KEY
Support NEW_RELIC_LICENSE_KEY

`NEW_RELIC_LICENSE_KEY` is supported by all APMs making it more likely to be used than `NEWRELIC_LICENSE_KEY` - See any of the APM docs, https://www.npmjs.com/package/newrelic has a mention of it for example.
NewRelic-Python-Plugins/newrelic-python-agent,NewRelic-Python-Plugins/newrelic-python-agent,NewRelic-Python-Plugins/newrelic-python-agent