Add missing bit of r4183

This bit got missing when we merged the new epoll acceptor for 2.0.

Disable SO_LINGER when we time out a connection due to sess_timeout,
so that we do not RST connections that have still not transmitted
their data.

git-svn-id: http://www.varnish-cache.org/svn/branches/2.0@4341 d4fa192b-c00b-0410-8231-f00ffab90ce4

bin/varnishd/cache_acceptor_epoll.c

@@ -192,6 +192,7 @@ vca_main(void *arg)
 			if (sp->t_open > deadline)
 				break;
 			VTAILQ_REMOVE(&sesshead, sp, list);
+			TCP_linger(sp->fd, 0);
 			vca_close_session(sp, "timeout");
 			SES_Delete(sp);
 		}