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/compat b/debian/compat
new file mode 100644
index 0000000..ec63514
--- /dev/null
+++ b/debian/compat
@@ -0,0 +1 @@
+9