This change modifies the CentOS build CI jobs to use a CentOS 8 host
image.
NOTE: This does not affect the version of CentOS used as the base image
in containers built by kolla.
Partially-Implements: blueprint centos-rhel-8
Partially-Implements: blueprint centos-rhel-python3
Change-Id: Ie25b54a4e6116ed2bcb9c3b5c44eb6edbd2e6b49
This should serve as a base for retrieving useful information from the
kolla build logs.
For now, the script warns about obsolete package names and helps track
packages that are installed too many times in different images.
It only supports rpm-based distros for now.
Change-Id: I160b6ede1336bd0c202621a48ca0218f72fc1270