Release a new newton release of neutron

This release is primarily to fix regression sneaked into official
releases with 9.3.0 that is a bug #1680912 where a network delete
request may hang indefinitely, spinning CPU until a port delete for the
network comes in.

This release effectively reintroduces bug #1672701 because it reverted a
fix that was intended to fix it for the sake of killing the newly
introduced regression. A follow up release may fix bug #1672701 later.

This release includes only neutron core, it doesn't attempt to release
any subprojects.

Change-Id: I3183b7adc500bf0aa05e5b750bda16945b55d718
Related-Bug: #1680912
Related-Bug: #1672701

deliverables/newton/neutron.yaml

@@ -74,3 +74,13 @@ releases:
       * Don't create HA resources until needed
       * Bulk creation of SecurityGroups
       * DVR: Add static routes to FIP namespace
+  - version: 9.3.1
+    projects:
+      - repo: openstack/neutron
+        hash: e4aac689002645b837c12f23470fea5e61600a21
+    highlights: |-
+      * Fixed a bug where network delete request may hang indefinitely,
+        spinning up CPU until a port from the network is deleted
+      * Switched to 'subquery' for 1-M relationships when fetching
+        relationships from database to improve scalability
+      * Throttle SIGHUPs to keepalived to avoid data plane flips