Make minor improvements to scheduler

While running some local performance tests of the bridge descriptor sanitizer I noticed a few possible improvements:

• I noticed that the default configuration changed some paths, like, move multiple directories under out/. Can we undo that change, so that CollecTor uses the exact same paths in the new default configuration as previously?

• The recent/ directory is not truly configurable. I can change that along with the other bugfixes to the bridge descriptor sanitizer, if you want.

• It seems like the scheduler calculates how many minutes it needs to sleep from the current system time to start the next run with x minutes offset from the period of y minutes. Example: system time is 20:43:15.123, period is 60 minutes, offset is 44 minutes, the scheduler will start the next run at 20:44:15.123, but really it should start it at 20:44:00.000.

• Can we add a mode to run a given module immediately, skipping the scheduler entirely? That would be quite useful for testing, batch-processing, and maybe other purposes. Onionoo has such a mode with --single-run (or however it's called). But please don't break the design too much to make this work, if it's too ugly, skip this.