STRING vmod_std.fileread(STRING filename)
function, which will read the contents of a file, typically
for use in synthetic responses.

Submitted by:	Sanjoy Das


git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@5592 d4fa192b-c00b-0410-8231-f00ffab90ce4