Add release note on drop-nova-network

blueprint drop-nova-network

Also introduces shorthand directive for launchpad bug and blueprint

Change-Id: I0664ccc0652c8b1428359daadb5f4d456a5a15b7

releasenotes/notes/drop-nova-network-2186d008f696cfa7.yaml

@@ -0,0 +1,10 @@
+---
+upgrade:
+  - |
+    [:blueprint:`drop-nova-network`]
+    Horizon nova-network floating IP and security groups supports have been
+    droppped in Pike release. nova-network has been marked as deprecated
+    in Nova in Newton release and horizon support was dropped in favor of it.
+    Neutron now becomes a requirement for floating IP and security groups.
+    Other operations on instances which created with nova-network should
+    work same as before.

releasenotes/source/conf.py

@@ -40,8 +40,23 @@
 extensions = [
     'oslosphinx',
     'reno.sphinxext',
+    'sphinx.ext.extlinks',
 ]
 
+# Set aliases for extlinks
+# - generic launchpad bug - [:bug:`12345`]
+# - horizon blueprint - [:blueprint:`drop-nova-network`]
+extlinks = {
+    'bug': (
+        'https://bugs.launchpad.net/bugs/%s',
+        'bug ',
+    ),
+    'blueprint': (
+        'https://blueprints.launchpad.net/horizon/+spec/%s',
+        'blueprint ',
+    ),
+}
+
 # Add any paths that contain templates here, relative to this directory.
 templates_path = ['_templates']