Setting up varnishncsa instance for erbium

This stops emery's varnishncsa instance.  I will manually remove
the init.d/varnishncsa-emery file once we've fully switched
over to using unicast on erbium rather than the multicast relay.

This uses a nonstandard udp2log port (8419) so as not to duplicate
the traffic udp2log is receiving on erbium right now.

See RT 6143

Change-Id: I484f6e3500869dee38caa8afb0434bad11499cc4