Feed logs from ssl terminators again into webstatscollector's filter

Since webstatscollector's filter is on purpose dropping logs of
requests from internal IPs, webstatscollector is dropping the cache's
logs of the requests the ssl terminators relay to the caches. Hence,
to have webstatscollector count ssl traffic, we need to make sure to
get the logs from the ssl terminators themselves into
webstatscollector's filter.

With the decomissioning of emery, erbium had it's udp2log setup
changed [1] and hence was no longer getting logs from the ssl
terminators. As erbium was also running the webstatscollector's
filter, we were effectively no longer counting ssl traffic. Hence, we
now move webstatscollector's filter to oxygen, which consumes the
whole udp2log multicast stream including logs from ssl
terminators. Thereby, webstatscollector's filter is reporting ssl
traffic again to the collector on gadolinium.

[1] 79ba1d60b713533740d27728234c4bbb8fe60f8c

Bug: 67456
Change-Id: I6a324ee9c4ef876c203e4944a695938507ed48ad