erp5: make testrunner access zserver through apache
Default behavior of runUnitTest was to listen on 127.0.0.1/localhost, which is not
allowed for SlapOS instance and caused issues when the used DNS server does not resolve localhost.
Instead, we decided to run the zserver on the partition IP. Because this partition's IP is not seen as a secure origin (as defined in https://goo.gl/Y0ZkNV ) from firefox when running zelenium tests, we also add some entries in apache from balancer partition to act as an https proxy on this zserver and change the testrunners to access the https URL.
See also erp5!729 (merged) for the erp5 part.