test: drop cat $tty, seems to not be needed

I'll have to ask Jacques what this was for, because it doesn't seem to
be needed to run and monitor the test.  Also, it lingers at shutdown,
causing some unintended side effects in Finit.

Commenting out for now, as a reminder to myself.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

test/tenv/lib.sh

@@ -141,6 +141,6 @@ log "$color_reset" 'Setup of test environment done' ''
 
 finit_pid=$(retry "pgrep -P $finit_ppid")
 
-tty=/dev/$(texec cat /sys/class/tty/console/active)
-texec cat "$tty" &
-sleep 1
+#tty=/dev/$(texec cat /sys/class/tty/console/active)
+#texec cat "$tty" &
+#sleep 1