Rely on ID/VERSION_ID to detect distro
Rely on ID/VERSION_ID to detect distro

REDHAT_SUPPORT_PRODUCT* are removed from recent
CentOS8.3 release[1], Let's use ID/VERSION_ID instead
which are available[2] and would serve our purpose.

[1] https://git.centos.org/rpms/centos-linux-release/c/2e3df0
[2] https://www.freedesktop.org/software/systemd/man/os-release.html

Change-Id: Ic10b461dde012e01de87eaf03745f17fbaf704e8

mahak/packstack,fr34k8/packstack,fr34k8/packstack,stackforge/packstack,openstack/packstack,stackforge/packstack,fr34k8/packstack,stackforge/packstack,openstack/packstack,openstack/packstack,mahak/packstack,mahak/packstack