Merge "Add release note about keystore rotation"

releasenotes/notes/keystore-rotation-92faea5a423a3160.yaml

@@ -0,0 +1,12 @@
+---
+features:
+  - |
+    The Zuul keystore now supports credential rotation.
+
+    New `zuul-admin` commands support creating, listing, and deleting
+    project secrets keys, project SSH keys, and tenant SSH keys.  See
+    :doc:`/client`.
+
+    The keystore password itself may also be rotated via the mechanism
+    described in the :ref:`keystore.password <keystore-password>`
+    configuration.