This update ensures the 'Platform Backup' partition label
is assigned to a newly created partition so that it gets
mounted properly.
This update cleans the prestage directory prior to new
prestaging.
Test Plan:
PASS: Verify prestaging partition create if missing
PASS: Verify prestaging cleanup before staging new files
PASS: Verify prestaged failure handling with small disk.
PASS: Verify prestaging image install and login.
PASS: Verify back to back prestaging installs
PASS: Verify reboot recovery after prestaging install
Story: 2009291
Task: 43825
Change-Id: I8f51b9d91ba7fd32e722a37f8336397959ba6ed6
Depends-On: https://review.opendev.org/c/starlingx/metal/+/817779
Signed-off-by: Eric MacDonald <eric.macdonald@windriver.com>
e4d4fec506