- Add missing -k and -u option from sysupgrade page.
- Fix missing check for image verification exit code
- Provide the actual reason of the image verification
Fixes: #4160
Signed-off-by: Ansuel Smith <ansuelsmth@gmail.com>
(cherry picked from commit 0f4f6e89f15aa1dac0bfd676cb8364ef0b6c6e1f)