Added the -n option for specifying a name for varnishd. All files are now stored...

Added the -n option for specifying a name for varnishd. All files are now stored under /tmp/<name> where
<name> is either a specified name or the hostname. All the varnish tools have also been updated to let the user
specify the name of the varnish instance to use. The name must conform to the hostname standard, but a test
for this is not yet implemented.

git-svn-id: svn+ssh://projects.linpro.no/svn/varnish/trunk@1521 d4fa192b-c00b-0410-8231-f00ffab90ce4