Notes
- Added instrumentation for - mysql2/promise.- This previously only existed in our standalone @newrelic/mysql, but now gives feature partiy between the two.
 
- This previously only existed in our standalone 
- Removed unused native CPU metric sampler. This logic was no longer getting touched when running Node.js versions higher than 6.1.0. 
- Fixed promise interceptor from re-throwing errors. 
- Added transaction naming documentation ported from a discussion forum post. 
- Added - promises.tap.jsto mysql2 versioned tests.
- Updated @newrelic/test-utilities to latest. 
- Removed unused test file in restify versioned tests. 
- Added - --strictflag to versioned test runner to properly fail CI runs when test files are not included.