Mark Goddard 6c86915597 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
2019-11-26 10:22:06 +00:00
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