Update master for stable/victoria

Add file to the reno documentation build to show release notes for
stable/victoria.

Use pbr instruction to increment the minor version number
automatically so that master versions are higher than the versions on
stable/victoria.

Change-Id: Iedf3cb71a2554faae75e0fe40bcdc889476cf4b5
Sem-Ver: feature

releasenotes/source/index.rst

@@ -6,6 +6,7 @@ os-net-config Release Notes
    :maxdepth: 1
 
    unreleased
+   victoria
    ussuri
    train
    stein

releasenotes/source/victoria.rst

@@ -0,0 +1,6 @@
+=============================
+Victoria Series Release Notes
+=============================
+
+.. release-notes::
+   :branch: stable/victoria