Revert "Reduce log level to `error` in newrelic.js"

This reverts commit b828c01ed5cc4cbf2246756816619e19bf11a05e.
Revert "Enable New Relic tracer 1.7.0."

This reverts commit b80faa7e0789bdf610f80cf5aef7c2b8e6715d93.