healthcheck middleware should be deployed as app instead of filter

[Takashi Kajinami]

Since oslo.middleware 3.22.0[1], deploying healtcheck middleware as a filter is deprecated and it should be deployed as an app.

[1] https://review.opendev.org/c/openstack/oslo.middleware/+/403734

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/c/openstack/glance/+/802148

[OpenStack Infra (hudson-openstack)]

Change abandoned by "Takashi Kajinami <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/glance/+/802014

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.opendev.org/c/openstack/glance/+/802148
Committed: https://opendev.org/openstack/glance/commit/fa9450d5b58866e4a6b928995a8bf18b4bb8f0c7
Submitter: "Zuul (22348)"
Branch: master

commit fa9450d5b58866e4a6b928995a8bf18b4bb8f0c7
Author: Takashi Kajinami <email address hidden>
Date: Fri Jul 23 20:53:24 2021 +0900

    Deploy healthcheck middleware as app instead of filter

    Using the healthcheck middleware as a filter is deprecated and
    the middleware should be used as an application[1].
     [1] 6feaa13610c450c8486f969703768db5319b4846

    This change updates definition and usage of the healthcheck middleware
    accordingly to avoid the following deprecation warning.

    DeprecationWarning: Using function/method 'Healthcheck.factory()' is
    deprecated: The healthcheck middleware must now be configured as
    an application, not as a filter.

    Closes-Bug: #1937901
    Change-Id: Id41e0313a481bea4e2bb14c69f2ad8a2070aa9be

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/glance 27.0.0.0b2 development milestone.