update ha_proxy_z1 in cf-job.yml to merge network config

This is needed to support the case where we run haproxy in
an external -> internal network config. It needs two networks
and the previous config hardcodes for a single network.

TH
Merge pull request #353 from thansmann/cf-jobs-haproxy-fix

update ha_proxy_z1 in cf-job.yml to merge network config