Test needs to check if int provided as result

[Joshua Harlow]

Due to CI gate timeouts (slow vms...) the following can happen:

TypeError: unsupported operand type(s) for +: 'Failure' and 'int'

http://logs.openstack.org/41/203441/3/gate/gate-taskflow-python34/91e2d34/console.html

2015-07-27 22:43:14.853 | Traceback (most recent call last):
2015-07-27 22:43:14.853 | File "/home/jenkins/workspace/gate-taskflow-python34/taskflow/tests/utils.py", line 54, in wrap_all_failures
2015-07-27 22:43:14.853 | yield
2015-07-27 22:43:14.853 | File "/home/jenkins/workspace/gate-taskflow-python34/taskflow/test.py", line 196, in assertFailuresRegexp
2015-07-27 22:43:14.853 | callable_obj(*args, **kwargs)
2015-07-27 22:43:14.853 | File "/home/jenkins/workspace/gate-taskflow-python34/taskflow/engines/action_engine/engine.py", line 148, in run
2015-07-27 22:43:14.853 | for _state in self.run_iter():
2015-07-27 22:43:14.854 | File "/home/jenkins/workspace/gate-taskflow-python34/taskflow/engines/action_engine/engine.py", line 199, in run_iter
2015-07-27 22:43:14.854 | self._change_state(states.FAILURE)
2015-07-27 22:43:14.854 | File "/home/jenkins/workspace/gate-taskflow-python34/.tox/py34/lib/python3.4/site-packages/oslo_utils/excutils.py", line 119, in __exit__
2015-07-27 22:43:14.854 | six.reraise(self.type_, self.value, self.tb)
2015-07-27 22:43:14.854 | File "/home/jenkins/workspace/gate-taskflow-python34/.tox/py34/lib/python3.4/site-packages/six.py", line 659, in reraise
2015-07-27 22:43:14.854 | raise value
2015-07-27 22:43:14.854 | File "/home/jenkins/workspace/gate-taskflow-python34/taskflow/engines/action_engine/engine.py", line 183, in run_iter
2015-07-27 22:43:14.854 | failure.Failure.reraise_if_any(failures)
2015-07-27 22:43:14.854 | File "/home/jenkins/workspace/gate-taskflow-python34/taskflow/types/failure.py", line 308, in reraise_if_any
2015-07-27 22:43:14.854 | failures[0].reraise()
2015-07-27 22:43:14.854 | File "/home/jenkins/workspace/gate-taskflow-python34/taskflow/types/failure.py", line 317, in reraise
2015-07-27 22:43:14.855 | raise exc.WrappedFailure([self])
2015-07-27 22:43:14.855 | taskflow.exceptions.WrappedFailure: WrappedFailure: [Failure: TypeError: unsupported operand type(s) for +: 'Failure' and 'int']

So to avoid that we should check if an int was actually returned before further usage (so we don't also mask the initial error).

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/206273

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/206273
Committed: https://git.openstack.org/cgit/openstack/taskflow/commit/?id=6dda5a55c06d71143915635260ff3a31783039ae
Submitter: Jenkins
Branch: master

commit 6dda5a55c06d71143915635260ff3a31783039ae
Author: Joshua Harlow <email address hidden>
Date: Mon Jul 27 18:04:12 2015 -0700

    Avoid adding 1 to a failure (if it gets triggered)

    Sometimes the CI gate times out and instead of returning
    normal results a failure object is returned, so be more
    careful on adding integers to those objects.

    Closes-Bug: 1478744

    Change-Id: Ibdb9d30266d2a7f3bfeacc39e74cf61b44025a56