emery: remove one udp2log logger.

RT #6143 says:
Not using them for anything now, no. If the existing logs can be easily
preserved, I would prefer to have access to them for retrospective
analysis. But if it's any degree of hassle, dump 'em.

Thanks for checking,
Jonathan

Change-Id: I50fd18aa805034e18eb38e2657eeecf042a9e575