beta: lvs upload IP set to the apache backends

The labs does not have support for LVS so we directly specify the two
Apache boxes as varnish backends.

Puppet error was:

$$$lvs::configuration::lvs_service_ips[$::realm]["upload"]["pmtpa"] is
not an hash or array when accessing it with uploadsvc at
/etc/puppet/manifests/role/cache.pp:382 on node i-000005de.pmtpa.wmflabs

Change-Id: I516921cb0d89ddb600613c2d6c6e55ebd87ee670