Add -f to varnishncsa, this makes varnishncsa prefer X-Forwarded-For
over client.ip

Closes: #335
Thanks to "191919" for the patch.


git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@3237 d4fa192b-c00b-0410-8231-f00ffab90ce4