Leave non-interactive at default QoS class

Lower class levels are less well defined, and non-interactive
SSH can carry various different types of applications.

This change also sets lowdelay class (AF21) earlier in an an outbound
dbclient session

cli-session.c

@@ -102,6 +102,9 @@ void cli_connected(int result, int sock, void* userdata, const char *errstring)
 		dropbear_exit("Connect failed: %s", errstring);
 	}
 	myses->sock_in = myses->sock_out = sock;
+	TRACE(("cli_connected"))
+	ses.socket_prio = DROPBEAR_PRIO_NORMAL;
+	/* switches to lowdelay */
 	update_channel_prio();
 }