s3gw: release v0.16.0

Signed-off-by: Joao Eduardo Luis <joao@suse.com>
(cherry picked from commit 6efb0cd)

docs/release-notes/latest

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-s3gw-v0.15.0.md
+s3gw-v0.16.0.md

docs/release-notes/s3gw-v0.16.0.md

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+# Release Notes - v0.16.0
+
+This release cycle focused on architecture adjustments to the s3gw service's
+backend store (SFS), which will be reflected on upcoming releases.
+
+Most noteworthy outcome of this release is the initial COSI support for s3gw.
+This can be enabled via the Helm Chart.
+
+We have also disabled user and bucket quotas via the UI. Quotas are currently
+not supported by the s3gw service, and have been kept in the UI to demonstrate
+what we believe to be the right approach to them. As the backend development
+progresses, quotas will be re-enabled when the right time comes.
+
+This release is meant for testing and feedback gathering. It is not recommended
+for production use.
+
+Should a bug be found and not expected to be related to the list below, one
+should feel encouraged to file an issue in our
+[GitHub repository](https://github.com/aquarist-labs/s3gw/issues/new/choose).
+
+## Features
+
+- Kubernetes: Add experimental COSI support.
+- UI: Add new experimental python backend for the UI.
+- UI: Disable bucket and user quotas in the UI.
+
+## Fixes
+
+- None
+
+## Breaking Changes
+
+- None
+
+## Known Issues
+
+- SFS: Non-versioned GETs may observe dirty data of concurrent non-multipart
+  PUTs.