Allow support for encryption and keymaster middleware

[Jose Phillips]

This feature will allow users to configure object encryption middleware providing a security layer of the object stored on the physical disk.

Also required for some AWSV4 S3 Auth that enforce encryption to perform the connection.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/714827

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.opendev.org/714972

[OpenStack Infra (hudson-openstack)]

Change abandoned by Jose Phillips (<email address hidden>) on branch: master
Review: https://review.opendev.org/714827
Reason: Created on another review

[Jose Phillips (jose-phillips)]

Please check review

Fix proposed to branch: master
Review: https://review.opendev.org/714972

[Ryan Beisner (1chb1n)]

Thank you for your work on this. It seems like a large enough feature proposal that a feature spec and implementation conversations are in order.

There are potential security and data accessibility implications, and I want to make sure this is implemented with core charmer design review and acceptance.

Please review the following information and spark the conversations as referenced.

https://docs.openstack.org/charm-guide/latest/feature-specification.html
https://docs.openstack.org/charm-guide/latest/how-to-contribute.html

That process will inherently flush out some of the other concerns that I have here, which are: unit test and functional test coverage of the newly-introduced charm feature.

Thanks again.

[OpenStack Infra (hudson-openstack)]

Change abandoned by "James Page <email address hidden>" on branch: master
Review: https://review.opendev.org/c/openstack/charm-swift-proxy/+/714972
Reason: This review is > 12 weeks without comment and currently blocked by a core reviewer with a -2. We are abandoning this for now. Feel free to reactivate the review by pressing the restore button and contacting the reviewer with the -2 on this review to ensure you address their concerns.