traffic-manager-demo-setup missing serverTestPages causing provisioning to fail

traffic-manager-demo-setup

BadRequest
Provisioning StateFailed
Timestamp‎8‎/‎2‎/‎2018‎ ‎2‎:‎45‎:‎23‎ ‎PM
Duration3 seconds
TypeMicrosoft.Resources/deployments
Resource Id/subscriptions/xxxx/resourceGroups/rgsample/providers/Microsoft.Resources/deployments/webServer1
StatusMessage{
"error": {
"code": "InvalidTemplate",
"message": "Unable to process template language expressions for resource '/subscriptions/xxxx/resourceGroups/rgsample/providers/Microsoft.Resources/deployments/webServer1' at line '110' and column '5'. 'The template variable 'serverTestPage1' is not found. Please see https://aka.ms/arm-template/#variables for usage details.'"
}
}
### Repro steps (*if necessary, delete otherwise*)
1. Deploy as is template
2. Provisioning Failed

Start with the traffic-manager-demo-setup template and inspect the deployment around line 110 for the reference to serverTestPage1, then compare its variables with the resources that use it. Reproduce by deploying the template as-is and confirm provisioning completes without the InvalidTemplate error.

Written by the indexing model from the issue text.