* Workflow output sometimes is not calculated correctly due to
the race condition between different transactions: the one that
checks workflow completion (i.e. calls "check_and_complete") and
the one that processes action execution completion (i.e. calls
"on_action_complete"). Calculating output sometimes was based on
stale data cached by the SQLAlchemy session. To fix this, we just
need to expire all objects in the session so that they are
refreshed automatically if we read their state in order to make
required calculations. See the bug description for more details
on how the problem was observed.
* Added another test for direct workflow that formally checks
calculation of workflow output. It doesn't pretend to test the
aforementioned issue (it can be reproduced only with a big number
of attempts, and/or under load). It's for the sake of the test
module completeness.
Change-Id: I4a7e7fd9a4bbb6e93df169b4b40bc2d83ccfce89
Closes-Bug: #1792090
dfdff78315