Comment 15 for bug 1888213

Reviewed: https://review.opendev.org/757061
Committed: https://git.openstack.org/cgit/openstack/neutron/commit/?id=20e8c6f55380bc94709bc3f25d5c8eebd1f56bee
Submitter: Zuul
Branch: stable/stein

commit 20e8c6f55380bc94709bc3f25d5c8eebd1f56bee
Author: Rodolfo Alonso Hernandez <email address hidden>
Date: Mon Jul 20 14:12:06 2020 +0000

    Import "oslo_config.cfg" before "eventlet"

    Eventlet will patch the "os" library and how it works.

    If "oslo_config.cfg" is called after "eventlet":
    - "oslo_config.cfg" imports "stevedore"
    - "stevedore" imports "importlib_metadata"
    - this library will try to use "os.open" library, but patched
    - "eventlet" imports "oslo_service"
    - "oslo_service" imports "oslo_logging"
    - "oslo_logging" imports "oslo_config.cfg", but at this point,
      the instance cfg.CONF does not exist yet

    If "oslo_config.cfg" is imported before calling eventlet,
    "oslo_logging" is not called and there is no circular import.

    Closes-Bug: #1888213

    [1]I8b08f289d446f4775eac1e1a91997fa96f25f641

    Change-Id: Idcc04f46b2a01e24dfd56cef8121694439e0339e
    (cherry picked from commit bc99e56515537210a35988d3fbdec0669469d0b3)