Release barbican RC1 for Antelope

This proposed a RC1 release for barbican to get any merged changes
out prior to the RC1 deadline for Antelope going into effect.

If the team is ready to proceed, please leave a +1 to acknowledge this
release and we will process right away. If the team is working on any
final merges, leave a -1 with some detail on the status and update the
patch with the new commit hash to use when ready.

Patches with no response will be merged by early Friday, March 03.

$ git log --oneline --no-merges 15.0.0.0rc1..5defb5c5
5defb5c5 Fix typo
f848fa9b Add content_types to the response dict
6814abb5 Fix tox4 error
f1046a60 Secret consumers documentation
651c2a8f Microversions documentation
455057c9 Fix typo in check_str for system_admin policy rule
6d348655 Remove six
564c1e50 Fix unit test error after cryptography update
155817a1 Imported Translations from Zanata
6112c302 Fix Story 2010258 (CVE-2022-3100)
dd94fa2f Change the unique properties of secret consumers
ffa7b113 Add audit middleware options to barbican.conf
08972d6a Switch to 2023.1 Python3 unit tests and generic template name
029233a1 Remove unnecessary hacking checks
7578118d Update master for stable/zed
1f28cb1e tox: Minor tweaks
33d42acb Update devstack plugin installation doc
d8ffdf91 Fix Barbican gate
55cc970b Imported Translations from Zanata
bf82d41e Imported Translations from Zanata
7844b72e Fix wrong assert statements
7ca2f066 zuul: Declare queue at top level
6e1a7ede Drop python3.6/3.7 support in testing runtime
b73046ff Remove unnecessary unicode prefixes

Signed-off-by: Hervé Beraud <hberaud@redhat.com>
Change-Id: I867fcff484dc820d1605e4bc327581ffe0ffcce8

deliverables/antelope/barbican.yaml

@@ -5,3 +5,11 @@ team: barbican
 type: service
 repository-settings:
   openstack/barbican: {}
+releases:
+  - version: 16.0.0.0rc1
+    projects:
+      - repo: openstack/barbican
+        hash: 5defb5c5d465c0bee797a34b80b94cc543fe0b1d
+branches:
+  - name: stable/2023.1
+    location: 16.0.0.0rc1