Added release note for NeutronExternalNetworkBridge deprecation

The previous patch [1] that changed the default value for the parameter and
that also deprecated the parameter missed a release note. This change
fixes the mistake.

[1] Iade7fbaf92c8c601227f4456a15ea3f13a907ee2

Change-Id: I72f6f7e50d729734ae6d61191f788ae2aed15145

diff --git a/releasenotes/notes/deprecate-NeutronExternalNetworkBridge-7d42f1a0718da327.yaml b/releasenotes/notes/deprecate-NeutronExternalNetworkBridge-7d42f1a0718da327.yaml
new file mode 100644 (file)
index 0000000..0906729
--- /dev/null
+++ b/releasenotes/notes/deprecate-NeutronExternalNetworkBridge-7d42f1a0718da327.yaml
@@ -0,0 +1,10 @@
+---
+upgrade:
+  - The ``NeutronExternalNetworkBridge`` parameter changed its default value
+    from ``br-ex`` to an empty string value. It means that by default Neutron
+    L3 agent will be able to serve multiple external networks. (It was always
+    the case for those who were using templates with the value of the parameter
+    overridden by an empty string value.)
+deprecations:
+  - The ``NeutronExternalNetworkBridge`` parameter is deprecated and will be
+    removed in a next release.