Make it possible to run a PoW onion service with a minimum effort level for test purposes
Some folks have asked if it's possible to run Tor in a way where you manually specifiy a min. effort level for a PoW enabled Onion Service. This allows them to test the overhead of PoW and figure out good values to use as maximum efforts they are willing to solve.
I think the feature should make it such that Tor always uses the given effort level when it is specified, thus changing the behaver slightly with that PoW won't be disabled even if there is no activity for the PoW.