Due to the unordered nature of sets, it is possible for signal
handlers like _gracefull_shutdown() to run first and clear the
_signal_handlers before other registered handlers have run.
This patch converts _signal_handlers from a set to a list and
then runs the handlers LIFO similar to how atexit functions are
run. Given that the handlers added in service.py are added after
clearing the signal_handlers, they are guaranteed to be the first
in the list and the last run.
Change-Id: Ief3ab2f56fa3d805296709e12e5f7a71560f7b6e
Closes-Bug: #2057809
Related-Bug: #2056366
Signed-off-by: Terry Wilson <twilson@redhat.com>
(cherry picked from commit d026081ca4)
(cherry picked from commit 028809f769)
daa2baa4b3