Factor out and make session timeouts more explicit. #887
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Relates to #860. See the thread over there for additional details.
Basically, we have always intended to have two session "timeouts" -- one that is a maximum absolute lifespan (4 hour default) and a background inactivity timeout (15 minute default). Somewhere along the way, these two values were blended, and the same timeout value was ultimately used for both.
The purpose of this PR is to once again separate these two times, and to make their names and usages more explicit.