rcutorture: Aggressive forward-progress tests shouldn't block shutdown

The more aggressive forward-progress tests can interfere with rcutorture
shutdown, resulting in false-positive diagnostics.  This commit therefore
ends any such tests 30 seconds prior to shutdown.

Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
This commit is contained in:
Paul E. McKenney 2019-07-10 08:30:00 -07:00
commit 60013d5d2b