Apply Stem patch for the new fallbackdir format

We changed things in the fallbackdir file format and Stem doesn't play well with them. We need to fix that.

This should work for Stem to pull in the newest format.

patch.diff

Okay, the patch looks reasonable. I am still testing it. What we need, though, is a clean version against 1.8.0 as DocTor does not work well with Stem's master right now, see (#40010 (closed) and child tickets). Could you attach such a thing?

Okay, it seems the Stem patch is still not enough:

 * 97D2A26EA5C9972E66D23F4698E94DBDBA8F6C18 => Unable to download from DirPort (Endpoints must be an stem.ORPort or stem.DirPort. '('185.220.101.20', 0)' is a tuple.)

The script has no DirPort check anymore. It seems those errors come directly from Stem.

Oh, and to be sure, I see such a line for essentially any of the supposed fallback dirs and get at the end:

[fallback-directories] 198/198 (100%) fallback directories have become slow or unresponsive...

moved from doctor-modules#6 (moved)

!8 (merged) is the MR for this ticket, fwiw.

Okay, this is working, nice. @dgoulet: could you squash the commits and give a hint about the bug number in the commit message? Then we are ready for merging I think.

assigned to @dgoulet

closed with commit 8074fc57