Add deploy_empty_node parameter to BM deployment

Caution: It doesn't add functionality!!!
It is required by heat template

PROD-35900

Change-Id: I710bceabc27f5be5d3fd670b6058b4e852abb1c2
diff --git a/tcp_tests/templates/heat-bm-cicd-pike-contrail-sl/underlay.hot b/tcp_tests/templates/heat-bm-cicd-pike-contrail-sl/underlay.hot
index cffb044..e11335f 100644
--- a/tcp_tests/templates/heat-bm-cicd-pike-contrail-sl/underlay.hot
+++ b/tcp_tests/templates/heat-bm-cicd-pike-contrail-sl/underlay.hot
@@ -51,6 +51,9 @@
   salt_master_control_ip:
     type: string
     default: 10.6.0.15
+  deploy_empty_node:
+    type: boolean
+    default: False
 
 resources:
   subnets: