Added YaST Console checkbox for enabling LUKS2 support

[lslezak]

Problem

Activating the experimental LUKS2 support added in #1245 is quite tricky:

• You need to remember the quite long YAST_LUKS2_AVAILABLE variable name
• If you forget to set it before starting YaST then you have to reboot the installation and start again 🤔
• Once set you cannot change it later

Solution

Add an checkbox in the YaST expert console, that makes the setting easily accessible and it can be changed even during installation.

This is a perfect use case why I introduced the YaST expert console.

Testing

• Tested manually
• Use the Ctrl+Alt+Shift+C (in Qt) or Ctrl+D Shift+C (in ncurses) keyboard shortcut to activate the expert console

Screenshots

Console Option

How it Works

• First show the default encryption options
• Then activate the YaST expert console and enable LUKS2
• Show the encryption options again, now with the LUKS2 option available

Notes

When we add some more options in the future we could add [Configure Partitioner] button and group the partitioner options in a separate subdialog like the network settings.

[coveralls]

Coverage increased (+0.003%) to 97.738% when pulling 7f80a9f on luks2_config into 2b18bf4 on master.

[shundhammer]

LGTM

[dgdavid]

LGTM too, but now version and changelog are in conflict.

[dgdavid]

LGTM, thanks!

[yast-bot]

✔️ Internal Jenkins job #209 successfully finished
✔️ Created IBS submit request #261396

[yast-bot]

✔️ Public Jenkins job #417 successfully finished
✔️ Created OBS submit request #943568