More acceptor work:

More acceptor work:

Make HTC_Rx() return a distinct value for overflow/blast.
Teach vca_handover() to handle HTC_Rx() return status
Use HTC_Rx/vca_handover this way in all three acceptors.
Eliminate vca_pollsession()
Teach CNT_First() about HTC_Rx states.
Log which acceptor we use in shmlog

git-svn-id: svn+ssh://projects.linpro.no/svn/varnish/trunk@2084 d4fa192b-c00b-0410-8231-f00ffab90ce4