This is a generalization of the trick we have used for things like
req.http.foobar, which can now also be used with other parts of
the namespace.

The plan is to use it for storage.disk1.free and similar.



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5650 d4fa192b-c00b-0410-8231-f00ffab90ce4