[SLE15-SP6] Restore the selected products (bsc#1218391)

[lslezak]

Problem

• https://bugzilla.suse.com/show_bug.cgi?id=1218391
• The upgrade summary from SLE12 does not list several modules and extensions
• From the y2log it turned out that the products were properly selected to install but later the package manager was restarted and the selected products were not restored back.

Solution

• Restore the selected products after reloading the package manager, properly install all products for new modules and extensions.

Testing

• Added a new unit test
• Tested manually

Notes

The upgrade_repo_manager.rb file has not been changed since SP5 where the problem does not happen. But it was not called at all there, so the bug was triggered by some other change. Anyway restoring the previous selection after reloading the package manager it always a good idea.

Screenshots

The original buggy behavior, for example the "Python 3" module was not displayed in the "Update Options" section although the repository service from SCC was added into the system:

With the fix the "Pyhon 3" module and some more are correctly listed:

[coveralls]

coverage: 40.922% (+0.01%) from 40.911%
when pulling 3da0820 on restore_selection_sp6
into 6b32196 on SLE-15-SP6.

[yast-bot]

✔️ Internal Jenkins job #5 successfully finished
✔️ Created IBS submit request #320713