- 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)