If we set `NumEntryGuards = 3` in torrc tor will use 3 entry guards for circuits. After running like this, if we change the torrc parameter to `NumEntryGuards = 2` and reload Tor, it will still use 3 entry guards that were sampled before and existent in the state file. I don't know what is our best way to treat this: - when `NumEntryGuards` and/or `NumPrimaryGuards` changes value, delete the state file and start with a fresh one? This is a simple fix, but not the best one. - when `NumEntryGuards` and/or `NumPrimaryGuards` changes its value (I can only see this use case when it changes the value to a lower number, not a higher one), check in the state file the last used entry guard(s) and remove from the primary list the difference of guards.