adding fix for hapi 6.9.0: https://github.com/hapijs/hapi/issues/1978

This may actually be a bug with Hapi--or it may be that newrelic is parsing data in a way that Hapi didn't expect. Might be fixed better in another place but this PR patches it and highlights the problem area.

Original report: https://github.com/hapijs/hapi/issues/1978