There should be a way to undo TAKEOWNERSHIP
It seems like it would be neat to have a way for a controller that has called TAKEOWNERSHIP to later relinquish "ownership" and tell a Tor process that it should not, in fact, exit if the controller exits.
I'm leaving this in the "Unspecified" milestone for now, since despite the fact that it seems we should obviously want this, I can't think of an actual usecase.
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