CI: Move to CentOS 8 nodepool images

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

.zuul.d/base.yaml

@@ -26,10 +26,10 @@
           C/rWcxTKlGJjjlVFZfhRHHy6gWBYH/SoozkbpkWbk0g43SLSxAuITy7nqLggOU=
 
 - nodeset:
-    name: kolla-centos
+    name: kolla-centos8
     nodes:
       - name: primary
-        label: centos-7
+        label: centos-8
 
 - nodeset:
     name: kolla-ubuntu-bionic

.zuul.d/centos.yaml

@@ -56,7 +56,7 @@
 - job:
     name: kolla-build-centos-binary
     parent: kolla-base
-    nodeset: kolla-centos
+    nodeset: kolla-centos8
     voting: false
     vars:
       action: build
@@ -75,7 +75,7 @@
 - job:
     name: kolla-build-centos-source
     parent: kolla-base
-    nodeset: kolla-centos
+    nodeset: kolla-centos8
     vars:
       action: build
       base_distro: centos

tests/files/process_build_logs.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.

tools/setup_RedHat.sh

@@ -3,21 +3,16 @@
 set -o xtrace
 set -o errexit
 
-# (SamYaple)TODO: Remove the path overriding
-export PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
-
 sudo tee /etc/yum.repos.d/docker-ce-stable.repo << EOF
 [docker-ce-stable]
 baseurl=$DOCKER_REPOS_MIRROR_URL/centos/7/\$basearch/stable
 enabled=1
 gpgcheck=1
 gpgkey=$DOCKER_REPOS_MIRROR_URL/centos/gpg
+module_hotfixes=True
 EOF
 
-sudo yum -y install docker-ce python3
+sudo dnf -y install docker-ce
-
-# Disable SELinux
-setenforce 0
 
 sudo systemctl start docker
 sudo docker info