ThreadGroup add_dynamic_timer_args and add_timer_args use
DynamicLoopingCall and FixedIntervalLoopingCall respectively. Both
classes have support for stop_on_exception, but this parameter was not
exposed in ThreadGroup functions to create timers.
This change adds the missing stop_on_exception to the timer functions so
that ThreadGroup timers can continue on exceptions if the user chooses
to do so.
Change-Id: If03276f290e86e95ddc0b1d749b7460ed752b8ef
Co-Authored-By: Zane Bitter <zbitter@redhat.com>
Duc Truong