Make scheduler_default_filters configurable

[Giuseppe Petralia]

Currently cinder charm doesn't not provide a way to configure default scheduler filters and they are always set to the default value:

#scheduler_default_filters = AvailabilityZoneFilter,CapacityFilter,CapabilitiesFilter

Ideally this should work similar to nova-cloud-controller charm option scheduler-default-filters

[Felipe Reyes (freyes)]

using `juju cinder config-flags` should work as a workaround (e.g. `juju cinder config-flags="scheduler_default_filters=MyFiter"` ), more details on the format(s) accepted at https://github.com/openstack/charm-cinder/blob/master/charmhelpers/contrib/openstack/utils.py#L1900

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/charm-cinder/+/826194

[Aurelien Lourot (aurelien-lourot)]

Added charm-guide as affected project so we add this new feature to the release notes.

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/charm-cinder/+/826194
Committed: https://opendev.org/openstack/charm-cinder/commit/7f97a6d30efa27f0738b10f411114e1f85919363
Submitter: "Zuul (22348)"
Branch: master

commit 7f97a6d30efa27f0738b10f411114e1f85919363
Author: Samuel Walladge <email address hidden>
Date: Tue Jan 25 09:39:30 2022 +1030

    Add support to configure scheduler_default_filters

    Add new config option: `scheduler-default-filters`.
    This is unset by default, so cinder retains the default value for
    scheduler_default_filters.

    Closes-Bug: #1956727
    Change-Id: I9777bf8fe5ddbb69689db60c2790e8a4be57e1ab

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/charm-guide/+/826774

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/charm-guide/+/826774
Committed: https://opendev.org/openstack/charm-guide/commit/82f75159a2c0dc11d3f13f8e6a3106379c16d50b
Submitter: "Zuul (22348)"
Branch: master

commit 82f75159a2c0dc11d3f13f8e6a3106379c16d50b
Author: Samuel Walladge <email address hidden>
Date: Fri Jan 28 07:49:55 2022 +1030

    Add release notes for `scheduler-default-filters`

    This is a new option in the cinder charm.

    Related-Bug: #1956727
    Change-Id: Ifdfdab1ca7b09ae25195c68eadbce5082b2d0364