Add package spec files for 2018.4.0 release

The spec was in another branch at 2018.4.0 release date.

Change-Id: I0d78e38209cb09603ac727b9c15c50d06c8087eb
Closes-bug: PROD-28554
diff --git a/debian/watch b/debian/watch
new file mode 100644
index 0000000..bff59ae
--- /dev/null
+++ b/debian/watch
@@ -0,0 +1,3 @@
+version=3
+opts="uversionmangle=s/\.(b|rc)/~$1/" \
+https://github.com/openstack/salt-formula-keystone/tags .*/(\d[\d\.]+)\.tar\.gz