to see if they get reused ended up being named "acceptors", which is a bad
name because we have another thread which accepts new connections.

Rename the "fake" acceptors to "waiters"



git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@3758 d4fa192b-c00b-0410-8231-f00ffab90ce4