2.19.3 - Scanner improvements

Those improvements seems to help in our testing setups.

Lets try them in production.

2.19.2 - Just a small fix in mirrorprobe

• Version is not optional
  TypeError: init() takes at least 3 arguments (3 given)

2.20.0-pre1- Improved IPv6 handling

This is the a test release with the IPv6 enhancements from @DimStar77

2.19.1 - What we actually use

This release reflects the state we used before we moved in the IPv6 patches from dimstar.

I mostly tagged this to simplify the package and have the debian package also use our patches.