CIPAAS-435 Update haproxy template to Openshift 3.11
CC/ @alossent
Using the 3.11 template (from: https://github.com/openshift/origin/blob/release-3.11/images/router/haproxy/conf/haproxy-config.template) with our customization embedded in the right places. The changeset looks bigger than it is due to some indentantion changes upstream.
I took the opportunity to drop https://gitlab.cern.ch/paas-tools/custom-haproxy-router/blob/master/conf/haproxy-config.template#L435-437 as this was included upstream.
Edited by Alexandre Lossent