open_sockets() did not count it as "good".  Having fixed this, revert to the
previous behaviour of keeping the sockets open if auto_restart is on; this
avoids having a brief window (until they are reopened) during which client
connections are refused.


git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@1711 d4fa192b-c00b-0410-8231-f00ffab90ce4