Stop counting ulsfo's varnish relayed https requests

In the current setup, https requests end up twice in the udp2log
stream. Once from the nginx-s, and once from the varnishes. To not
count both and hence overcount, the 'filter' process ignores the
varnish relayed request, by ignoring all requests that have an
"internal" IP address as client IP address. Since the IP addresses
used by ulsfo's nginx-s were not yet in that list, we add
them. Thereby we stop counting https from ulsfo twice.

By filtering out requests having a client ip from the 10.128.0.0/24
net, we drop requests where the following machines act as client:

* lvs400[1-4] : Those requests are strictly monitoring requests, so we
  should not count them anyways.
* backup4001: We currently do not see requests in the udp2log stream
  where this host acts as client.
* cp4001-cp4020: Those are all caches and some are SSL terminators. In
  their role as cache, they should not appear as client. In their role
  as SSL terminators, they may appear as client, but we already count
  such requests at the SSL terminators themselves, so we should not
  count them a second time. Hence, we can ignore them.

Change-Id: I7ec139dcc17e9b2eb8e5672d223e555729522c9b