[Merge] ~ghadi-rahme/ubuntu/+source/ppa-purge:ubuntu/devel into ubuntu/+source/ppa-purge:ubuntu/devel

[git-ubuntu bot]

You have been requested to review the proposed merge of ~ghadi-rahme/ubuntu/+source/ppa-purge:ubuntu/devel into ubuntu/+source/ppa-purge:ubuntu/devel.

For more details, see:
https://code.launchpad.net/~ghadi-rahme/ubuntu/+source/ppa-purge/+git/ppa-purge/+merge/460394

Currently ppa-purge will fail to revert packages on distributions using the deb822 source format. Starting with Mantic, deb822 ".sources" files have replaced the ".list" source files which lead to ppa-purge failing to disable the ppa on the system and causing the packages to not be downgraded to their initial version.

Disabling a ".sources" can be done in two main ways:
1- commenting out every line of the file (very messy and annoying to undo manually)
2- setting "Enabled: no" in the file

This patch disables ".sources" files using the second method.

Starting with this patch, ppa-purge will first iterate over all the ".list" files as before and then iterate over all the ".sources" files adding "Enabled: no" at the top of the file or setting any instance of "Enabled:" to "Enabled: no" in case "Enabled: yes" happened to be defined. 

Patch was tested using the oibaf mesa ppa (https://launchpad.net/~oibaf/+archive/ubuntu/graphics-drivers) in a Mantic lxc container.

-- 
Your team Ubuntu Sponsors is requested to review the proposed merge of ~ghadi-rahme/ubuntu/+source/ppa-purge:ubuntu/devel into ubuntu/+source/ppa-purge:ubuntu/devel.
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