Add upgrades meta files to /upgrades directory in Debian ISO.
Files include:
version
Version file to indicate the ISO release version
metadata.xml
Supportted upgrade path, and required patch
import.sh
Shell script to import the ISO load into StarlingX system
pxeboot-update-<rel-ver>.sh
Shell script to update pxeboot config file for new release
Test cases:
Build Debian ISO and visually inspect the existance of files
list above in /upgrades directory of Debian ISO.
Build Centos ISO with no changes.
Story: 2009303
Task: 45830
Change-Id: I1f0b42c6c37943b19bdf5dd7baaf81da5d1eef7a
Signed-off-by: Bin Qian <bin.qian@windriver.com>