HookManager emits warnings when hooks aren't loaded

[Matt Riedemann]

Ever since this change:

https://review.openstack.org/#/c/334014/

We get a lot of warnings in the nova logs for hooks that aren't loaded, e.g.:

http://logs.openstack.org/66/329466/4/check/gate-tempest-dsvm-multinode-live-migration/586c6be/logs/subnode-2/screen-n-cpu.txt.gz#_2016-08-03_00_45_26_933

2016-08-03 00:45:26.933 21672 WARNING stevedore.named [req-97af3388-11a8-4d5f-8e7e-9ae81a77b2ee tempest-LiveAutoBlockMigrationV225TestJSON-1828802368 tempest-LiveAutoBlockMigrationV225TestJSON-1828802368] Could not load instance_network_info

That comes from this hook:

https://github.com/openstack/nova/blob/master/nova/network/base_api.py#L33

Nova has it's own extension of the stevedore HookManager:

https://github.com/openstack/nova/blob/master/nova/hooks.py#L69

But Nova doesn't define hooks in tree. It seems that the HookManager in stevedore should provide a no-op callback to on_missing_entrypoints_callback in the NamedExtensionManager to avoid these warnings.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/353029

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/353029
Committed: https://git.openstack.org/cgit/openstack/stevedore/commit/?id=62398ed4a3376b52e0934a9e23b88bea60404972
Submitter: Jenkins
Branch: master

commit 62398ed4a3376b52e0934a9e23b88bea60404972
Author: Doug Hellmann <email address hidden>
Date: Tue Aug 9 13:30:08 2016 -0400

    do not emit warnings for missing hooks

    Add a flag to disable the default warning log messages in the
    NamedExtensionManager and then have the HookManager pass False by
    default.

    Change-Id: I78c91bcfd8cd41929f25057791157f82eb4a3a50
    Closes-Bug: #1611387
    Signed-off-by: Doug Hellmann <email address hidden>

[Doug Hellmann (doug-hellmann)]

This issue was fixed in the openstack/stevedore 1.17.1 release.

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/stevedore 1.17.1 release.