when update-status is implicitly handled it should not generate a log warning

[Alex Kavanagh]

When a charm handles the update-status implicitly (it is linked to hooks.py or equivalent, but is not handled explicitly, but instead is the last call in the generic main for hooks.py), then it should not generate an error. See (from hacluster) charm:

if __name__ == '__main__':
    try:
        hooks.execute(sys.argv)
    except UnregisteredHookError as e:
        log('Unknown hook {} - skipping.'.format(e), level=DEBUG)
    set_unit_status()

i.e. update-status is linked to hooks.py, the update-status does happen (set_unit_status()) but an error is logged for 'Unknown hook update-status - skipping' to the log.

Resolve this by suppressing the log message in some way.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/672483

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/672495

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/672491
Committed: https://git.openstack.org/cgit/openstack/charm-cinder-ceph/commit/?id=18ac7a93cc96ce3aefc938cf0c31e0f4af018cde
Submitter: Zuul
Branch: master

commit 18ac7a93cc96ce3aefc938cf0c31e0f4af018cde
Author: Alex Kavanagh <email address hidden>
Date: Wed Jul 24 11:31:05 2019 +0100

    Fix log update-status error

    This patch adds a dummy update_status function so that the update-status
    hook 'has' a function to run and thus silence the log error.

    Change-Id: I6a73943af9609810f1e40789c8d351278843dece
    Closes-bug: #1837639

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/672495
Committed: https://git.openstack.org/cgit/openstack/charm-neutron-openvswitch/commit/?id=9fcc8e55a5f978166455ddc0f8abeb14fe6249e6
Submitter: Zuul
Branch: master

commit 9fcc8e55a5f978166455ddc0f8abeb14fe6249e6
Author: Alex Kavanagh <email address hidden>
Date: Wed Jul 24 11:43:01 2019 +0100

    Fix log update-status error

    This patch adds a dummy update_status function so that the update-status
    hook 'has' a function to run and thus silence the log error.

    Change-Id: I1f008b1cb0958e90967a6a4e95fb0fddb37795f4
    Closes-bug: #1837639

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/672483
Committed: https://git.openstack.org/cgit/openstack/charm-ceilometer-agent/commit/?id=dec4b047168cb9341b5ff5704135fd038cde0bf1
Submitter: Zuul
Branch: master

commit dec4b047168cb9341b5ff5704135fd038cde0bf1
Author: Alex Kavanagh <email address hidden>
Date: Wed Jul 24 10:36:28 2019 +0100

    Fix log update-status error

    This patch adds a dummy update_status function so that the update-status
    hook 'has' a function to run and thus silence the log error.

    Change-Id: I96dfba233b98da60d8c138b84e8249cdda109563
    Closes-bug: #1837639

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/672325
Committed: https://git.openstack.org/cgit/openstack/charm-hacluster/commit/?id=f71fe595ce67e5e105e0ef8e75068850062d320a
Submitter: Zuul
Branch: master

commit f71fe595ce67e5e105e0ef8e75068850062d320a
Author: Alex Kavanagh <email address hidden>
Date: Tue Jul 23 17:05:39 2019 +0100

    Fix log update-status error

    This patch adds a dummy update_status function so that the update-status
    hook 'has' a function to run and thus silence the log error.

    Change-Id: Ia0ed9367809fd47c10ad6a57011555589a7d940c
    Closes-bug: #1837639