like XML.  Our definition of "looks like XML" is that the first
non-white-space character is '<'.

Add a new parameter "esi_syntax" with bits to steer the ESI parser.

Use the first bit to disable the "looks like XML" check.



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@3016 d4fa192b-c00b-0410-8231-f00ffab90ce4