Add model cookied-bm-contrail with MaaS

Change-Id: I8f29d684a5de003f2f1788cfb8c56a8ef819eae0
diff --git a/tcp_tests/templates/cookied-bm-contrail-maas/underlay--meta-data.yaml b/tcp_tests/templates/cookied-bm-contrail-maas/underlay--meta-data.yaml
new file mode 100644
index 0000000..3699401
--- /dev/null
+++ b/tcp_tests/templates/cookied-bm-contrail-maas/underlay--meta-data.yaml
@@ -0,0 +1,4 @@
+| # All the data below will be stored as a string object
+  instance-id: iid-local1
+  hostname: {hostname}
+  local-hostname: {hostname}