[leapp] At least X MB more space needed on the filesystem

Issue

• While trying to upgrade to RHEL 8.x with leapp, the following error message is printed:

  Error Summary
  -------------
  Disk Requirements:
     At least 1044MB more space needed on the / filesystem.
  

  Enlarging the root filesystem doesn't fix the issue.
  The file system requiring more space can be different that / above.

• leapp-upgrade.log file shows the following message

  [ERROR] Actor: target_userspace_creator Message: Unable to install RHEL 8 userspace packages.
  

• leapp fails with:

  There is not enough space on the file system hosting /var/lib/leapp directory to extract the packages