Implement the new-purge case where the entire expression comes
from VCL.

It is possible to instigate purges two ways from VCL now:

        sub vcl_recv {
                # Purge the req.url
                if (req.request == "PURGE") {
                        purge (req.url == req.url);
                        error 410;
                }

                # Take entire purge instruction from "Purge:" header
                if (req.request == "PURGESTR") {
                        purge ("" req.http.purge);
                        error 410;
                }

Testcase for this.



git-svn-id: http://www.varnish-cache.org/svn/branches/2.0@3724 d4fa192b-c00b-0410-8231-f00ffab90ce4