Keep track of all loaded VCL programs in the manager and tell the
child to load them via VCL.

Don't start he acceptor thread until a "start" command cones down
the CLI.

XXX: Right now we leak stuff when a VCL program is dicarded



git-svn-id: http://www.varnish-cache.org/svn/trunk@638 d4fa192b-c00b-0410-8231-f00ffab90ce4