Add release note for network endpoint type bugfix.

Related-bug: 1592368
Change-Id: I9bd8c3490e72b32ba48dc9d884c101d5e50867f9

Author: Stuart McLaren

releasenotes/notes/bug-1592368-a4af69f163a1e208.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - Fix for network OS_ENDPOINT_TYPE/--os-interface.
+    Previously these were being ignored for network commands
+    which resulted in the public endpoint always being used.
+    [Bug `1592368 <https://bugs.launchpad.net/bugs/1592368>`_]