Fix for bug 476 -- ESI was using null chars to deal with the strings, this made
it impossible to pass binary CDATA through the ESI parser. This switches it to
compare against the end pointer of the string. Test case attached.



git-svn-id: http://www.varnish-cache.org/svn/branches/2.0@4013 d4fa192b-c00b-0410-8231-f00ffab90ce4