Simplify how we manage the -f argument:

Simplify how we manage the -f argument:

The VCL file specified to -f must be read relative to the directory
from which varnishd is started, before we chdir to the workdir.

We used to deal with this by opening the file and passing the file
handle down.  It's simpler to just read the file and pass the actual
VCL code down.

git-svn-id: svn+ssh://projects.linpro.no/svn/varnish/trunk@3415 d4fa192b-c00b-0410-8231-f00ffab90ce4