podman inspect doesn't scale for our needs

[Emilien Macchi]

"podman inspect" command is used by various ways in TripleO, and it seems like to be a problem at scale.
The command is reading the container database and use locks to avoid race conditions; which is problematic when running the command for multiple containers at the same time.

This bug report is a placeholder for the patches we'll send to Paunch to mitigate the situation.

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/665731

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/666175

[OpenStack Infra (hudson-openstack)]

Change abandoned by Emilien Macchi (<email address hidden>) on branch: master
Review: https://review.opendev.org/665731
Reason: not in the plans for now

[OpenStack Infra (hudson-openstack)]

Change abandoned by Emilien Macchi (<email address hidden>) on branch: master
Review: https://review.opendev.org/666175

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/665731
Committed: https://git.openstack.org/cgit/openstack/paunch/commit/?id=6e2ef79af303866384f8dc4de83967dbfbb704a4
Submitter: Zuul
Branch: master

commit 6e2ef79af303866384f8dc4de83967dbfbb704a4
Author: Emilien Macchi <email address hidden>
Date: Mon Jun 17 10:51:13 2019 -0400

    Reduce the usage of "podman inspect" command

    - pull_missing_images: when podman is used, do not use "inspect" but
      "podman images exists" command. We only need to know if the image
      already exists, no need to fetch all its config.

    - unique_container_name: use container_exist to find out of the
      container already exists instead of calling the "inspect" command.

    Related-Bug #1833081
    Change-Id: I1aad33bcdcede1034bc8e1267b07f84c34a09958

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: stable/stein
Review: https://review.opendev.org/669732

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/669732
Committed: https://git.openstack.org/cgit/openstack/paunch/commit/?id=9cbedbfdb1c41501a7d020db1530bc87dd9264db
Submitter: Zuul
Branch: stable/stein

commit 9cbedbfdb1c41501a7d020db1530bc87dd9264db
Author: Emilien Macchi <email address hidden>
Date: Mon Jun 17 10:51:13 2019 -0400

    Reduce the usage of "podman inspect" command

    - pull_missing_images: when podman is used, do not use "inspect" but
      "podman images exists" command. We only need to know if the image
      already exists, no need to fetch all its config.

    - unique_container_name: use container_exist to find out of the
      container already exists instead of calling the "inspect" command.

    Related-Bug #1833081

    (cherry picked from commit 6e2ef79af303866384f8dc4de83967dbfbb704a4)

    Change-Id: I78fbdc17073f48790fefd35f63bc6216697f65e1