Move debian dir to the master

Add debian dir to combine building workflow

Change-Id: I07f3b6cfa35da1337af81580b230e5831f66aff3
PROD: https://mirantis.jira.com/browse/PROD-20910
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