CORD-3118 Mount node key in ONOS container for VTN (optional)

Change-Id: I61fd1f94c59db0992e640167e4cc28325f7d8be0
diff --git a/xos-services/vtn-service/templates/_tosca.tpl b/xos-services/vtn-service/templates/_tosca.tpl
index f1d630a..49f0ba8 100644
--- a/xos-services/vtn-service/templates/_tosca.tpl
+++ b/xos-services/vtn-service/templates/_tosca.tpl
@@ -35,7 +35,7 @@
           localManagementIp: 172.27.0.1/24
           ovsdbPort: 6641
           sshUser: {{ .sshUser }}
-          sshKeyFile: /root/node_key
+          sshKeyFile: /root/vtn/node_key
           sshPort: {{ .sshPort }}
           xosEndpoint: xos-chameleon:9101
           xosUser: {{ .xosAdminUser }}