"ERROR [oslo_messaging._drivers.zmq_driver.zmq_async] ZeroMQ not found!" shows up in other projects and isn't necessary

[Matt Riedemann]

Loading oslo.messaging drivers logs an error if you don't have zeromq available since this change in oslo.messaging 4.0.0:

https://github.com/openstack/oslo.messaging/commit/52ccff7cbc26af0738d7a0a7d6e99330421b61d1

This would be fine except it shows up in nova unit test logs, which is unnecessary if you're not testing zeromq:

http://logstash.openstack.org/#dashboard/file/logstash.json?query=message:%5C%22ERROR%20%5Boslo_messaging._drivers.zmq_driver.zmq_async%5D%20ZeroMQ%20not%20found!%5C%22%20AND%20tags:%5C%22console%5C%22

It's showing up in any consumer of oslo.messaging, so more than just nova, e.g.:

http://logs.openstack.org/26/259626/3/check/gate-ceilometer-dsvm-functional-postgresql/ac9da32/console.html#_2015-12-22_00_22_09_277

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/260322

[ChangBo Guo(gcb) (glongwave)]

Fix proposed in https://review.openstack.org/260322

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/260322
Committed: https://git.openstack.org/cgit/openstack/oslo.messaging/commit/?id=e8703dc80287614581a64e4cc090e37b4caa2452
Submitter: Jenkins
Branch: master

commit e8703dc80287614581a64e4cc090e37b4caa2452
Author: ChangBo Guo(gcb) <email address hidden>
Date: Tue Dec 22 12:59:35 2015 +0800

    zmq: Don't log error when can't import zmq module

    Method import_zmq returns None if can't import zmq module.
    For runtime code, an ImportError is raised, and for tests,
    a skip message "zmq not available" is sent, so it's unnecessary
    to log error which shows up in other projects' unit test logs.

    Co-Authored-By: Oleksii Zamiatin <email address hidden>
    Change-Id: Iebf15042f45da56eb633a0a70822c487dc72c884
    Closes-Bug: #1528415

[Davanum Srinivas (DIMS) (dims-v)]

This issue was fixed in the openstack/oslo.messaging 4.1.0 release.