The CLI commands in the file are executed before the worker
process is started, and the output is sent to stderr.

CLI failures (!= 200) are fatal, unless the command is prefixed
with a '-' in the file.

You can now do things like:

	$ cat I.file
	vcl.load vcl1 /foo/bar1.vcl
	vcl.load vcl2 /foo/bar2.vcl
	vcl.load vcl3 /foo/bar3.vcl
	start
	$ varnishd -f '' -I I.file -a :80 [...]