(1)Release Version Upgrade
(2)Matching code changes with el7 to el8
(3)Delete haproxy-env-var.patch, as el8.src.rpm contains the patch info
the new version 1.8.15 contains the functionality provided by the patch
(as opposed to el8.src.rpm). Looking at the history, haproxy-1.6 added the ability
to use environment variables in the configuration file, which is what was patched back,
about patch haproxy-env-var.patch, so delete it.
Change-Id: I44f5182f233d3a59f750e90b4af15f49c5da3543
Story: 2006729
Task: 37680
Depends-On: https://review.opendev.org/#/c/696481/
Depends-On: https://review.opendev.org/#/c/696050/
Signed-off-by: Long Li <lilong-neu@neusoft.com>