Fix version number in CentOS payload
{"bootstrap-payload":
{"name": "Graph.InstallCentOS",
"options": {"defaults": {
- "version": "7",
+ "version": "6.5",
"repo": "http://172.31.128.1:8080/repo/centos/6.5",
"rootPassword": "1234567",
"hostname": "rackhdnode",
