(1)Release Version Upgrade
(2)Matching code changes with el7 to el8
For CentOS 7, shim srpm for shim-unsigned
for CentOS 8, shim-unsigned srpm for shim-unsigned.
Story: 2006729
Task: 38736
Change-Id: If5255a3397c0fafb7a9a0dd779afaf6d8a340f35
Signed-off-by: Long Li <lilong-neu@neusoft.com>