Cperello/rpcproxy fixes

This branch is a "forward" port of the changes tested and done against 3.2 + cperello/haproxy branch that installs Openchange's rpcproxy service behind haproxy.

The workflow must be improved, but at least is functional with a fixed domain: rpcproxy.$hostname-fqdn

I tested both, http and https connections and after 5 minutes I didn't see any complain from Outlook about losing the connection and I see "old" process open handling traffic on port 443.

Let's continue with plan B! :dancers: