container prepare needs to use parameter DockerRegistryMirror

[Steve Baker]

Any pull operations from docker.io need to happen via the value of DockerRegistryMirror if that has been specified. Currently this only happens for docker pull, via its configured service.

This bug is to track the python-based inspect using DockerRegistryMirror when available.

skopeo doesn't currently support mirrors at all, so this needs to not regress if/when there is a switchover to the skopeo copier.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/614670

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/614670
Committed: https://git.openstack.org/cgit/openstack/tripleo-common/commit/?id=e703ec1aa8c240f4a0aa9c23142a44134c57a970
Submitter: Zuul
Branch: master

commit e703ec1aa8c240f4a0aa9c23142a44134c57a970
Author: Steve Baker <email address hidden>
Date: Thu Nov 1 14:42:44 2018 +1300

    Use DockerRegistryMirror to proxy requests

    This change consumes the DockerRegistryMirror parameter and uses that to proxy
    requests to docker.io for auth and inspect calls.

    This should improve the reliability of CI when unproxied calls to
    docker.io can fail.

    Change-Id: I11664091272d9bd216788217c0293b31d88e2758
    Depends-On: If896c22bf449a3ac91ca363648f84dd5b9aef227
    Closes-Bug: #1800958

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/tripleo-common 10.2.0 release.