vhost frontend: fix annotation logging

Bug 1092426 - "-DOpenShiftAnnotateFrontendAccessLog" option does NOT
work with vhost frontend plugin.
https://bugzilla.redhat.com/show_bug.cgi?id=1092426

A dynamic part of the template was moved to a static include. It fails
when the annotation option is set. The fix is to set env vars in the
dynamic template and log them in the include.