Javier Pena 70aff57869 Switch CentOS 7 mirror source to kernel.org mirror
The current source for our sync is outdated [1], and does not include
the latest CentOS 7.9 content. This is breaking some jobs relying on
CentOS, since they may have more recent packages in the image than
in the repositories [2].

[1] - https://mirror-status.centos.org/
[2] - https://bugs.launchpad.net/tripleo/+bug/1904214

Change-Id: Ie404396b0f108121241bdc26dd8d22c85106b0c4
2020-11-16 11:34:07 +01:00
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