MINOR: session: set the CO_FL_CONNECTED flag on the connection once ready

If we know there's no handshake, we must set the flag on the connection,
it's not the job of the stream initializer to do it.
diff --git a/src/session.c b/src/session.c
index 7f4e45e..790f89a 100644
--- a/src/session.c
+++ b/src/session.c
@@ -193,6 +193,8 @@
 		return 1;
 	}
 
+	/* OK let's complete stream initialization since there is no handshake */
+	cli_conn->flags |= CO_FL_CONNECTED;
 	ret = stream_accept_session(sess, t);
 	if (ret > 0)
 		return ret;