Add support for specialized & network disks and advanced partitioning message bar

[jikortus]

This is needed to cover RTT-4125.

[pholica]

Also, could you please use the full "specialized" instead of "spec". "spec" is also used as "specification".

[jikortus]

Also, could you please use the full "specialized" instead of "spec". "spec" is also used as "specification".

Agreed, this is probably safer. Not that such a thought didn't come to my mind as well - but I thought it would be better not to use such a long element name.

[jikortus]

I changed the behaviour of the Done button check so that it only checks the done_handler result as we agreed in our discussion about the proper way to handle this. The check for Done button in the advanced & network disks subspoke is now only handled by add_specialized_disk_check.

[pholica]

Hmm, as this is fork based pull request the downstream CI was not triggered :/

[jikortus]

@pholica Thanks for the suggestion, I pushed the related content in a new branch directly in rhinstaller/anabot. It looks like the CI hasn't been triggered as well again, is there anything else needed?

[pholica]

No, the push should be sufficient, let's discuss this via different channels as the only last thing needed for this Pull request is to test the changes in the downstream and if that's successful, I'll merge this pull request.