CORD-2772 set version number for openstack service

Change-Id: Ifb3e46567721c85be9696e30f34bbb6329d3d2cf
diff --git a/VERSION b/VERSION
new file mode 100644
index 0000000..519af9a
--- /dev/null
+++ b/VERSION
@@ -0,0 +1 @@
+6.0.0.dev