Split the states that are not task states (but are retry
states) into there own additional set and then use that set
and a new function to validate the transition at other locations
in the code-base.
This makes the transitions that are valid for tasks/retries
easily viewable, more easy to read and understand, and
more correct (instead of being a mix of task + retry atom
transitions and states).
Change-Id: I9515c19daf59a21e581f51e757ece2050f348214
2fa4af7a24
