Un-pin New Relic version

Previously, the version of New Relic had been pinned to 3.4.1 since
3.4.2 had a show-stopper bug.  This change un-pins that version and
points it at 3.5.+ as recommended by the New Relic team.

[#65458276]
Merge 65458276-newrelic-3.5 to master

[Completes #65458276]