When we launch Elasticsearch with the APM monitoring
agent, we create a temporary configuration file to
securely pass the API key or secret. This temporary
file is cleaned up on Elasticsearch Node creation.

After we renamed the APM module, the delete logic
didn't get updated, which means we never delete the file
anymore.

This commit:
 - fixes the APM module pattern match when we delete
 - adds additional delete safety net on failed node start
 - adds tests for ensuring the naming dependency isn't
   broken again.