beta: fill in swift backend for upload varnish

The beta cluster is lacking a Swift cluster. We are using an instance
with Nginx which serves thumbnails much like we used to do in production
back in 2013.

The instance is not puppetized, we will look at adding a Swift cluster
later on.  Meanwhile the instance got copy pasted from pmtpa to eqiad
and we have to fill in the LVS configuration used by the upload varnish
as a backend.

Since the LVS configuration hash vary by realm, it must be a noon
for production.

Change-Id: Id76d593dedff0a1ba3ed5ee524386d61f2c63598
Merge "beta: fill in swift backend for upload varnish" into production