Tell reno to ignore the kilo branch

When reno 3.x runs under setuptools, it scans all of the branches it can
find, including any that look like they're closed and have an -eol tag.

This patch is a copy of one similar in cinder repo:
https://review.opendev.org/707495

Change-Id: I50a50f75a1e70ccc183f598099f0e2f0fff8985a

.gitignore

@@ -16,8 +16,11 @@ coverage-karma
 pep8.txt
 pylint.txt
 # Files created by releasenotes build
+RELEASENOTES.rst
 releasenotes/build
+releasenotes/notes/reno.cache
 reports
+
 openstack_dashboard/local/*
 !openstack_dashboard/local/local_settings.py.example
 !openstack_dashboard/local/enabled/_50__settings.py.example

reno.yaml

@@ -0,0 +1,3 @@
+---
+# Ignore the kilo-eol tag because that branch does not work with reno.
+closed_branch_tag_re: "(.+)(?<!kilo)-eol"