[Merge] ~enr0n/software-properties:deb822 into software-properties:ubuntu/master

[Nick Rosbrook]

Nick Rosbrook has proposed merging ~enr0n/software-properties:deb822 into software-properties:ubuntu/master.

Requested reviews:
  Julian Andres Klode (juliank)

For more details, see:
https://code.launchpad.net/~enr0n/software-properties/+git/software-properties/+merge/440177

Remove extendedsourceslist.py and add deb822 support for PPA sources.
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