Adding gadolinium as a webrequest udp2log receiver.

See RT 4720.

This also requires that squid's frontend.conf.php is edited to add
gadolinium as a udp2log logging destination.  A patch is available on
fenari:/home/otto/frontend.conf.php.rt.4720.patch

Change-Id: I4c6c8a257b9a58be00904f9857d8315a94e9e356
Merge "Adding gadolinium as a webrequest udp2log receiver." into production