The class RestorableFile is using the old format of backup and need to be converted to the new format.

On the other hand, we have the NewRestorableFile class that was created with that purpose, so we need to compare both classes and figure out the differences and stick with the NewRestorableFile and convert it back to RestorableFile.

Acceptance Criteria

• Compare both the NewRestorableFIle and RestorableFile to match the differences between them
• Remove the old RestorableFile class after the comparision
• Rename the NewRestorableFile to RestoraleFile
• Adapt the following files with the needed changes for the RestorableFile
  • redhatrelease.system_release_file.restore()
  • redhatrelease.os_release_file.restore()
  • pkghandler.versionlock_file.restore()