redis URL not created correctly in multitenant environment

[satyaj]

Using the ansible script for creating the gateways, the gateway environment variables are not substituting the value of redis URL.
The variable is: REDIS_URL, and value is: redis://system-redis.${THREESCALE_AMP_NAMESPACE}:6379/1

It uses this template:
https://raw.githubusercontent.com/gpe-mw-training/3scale_onpremise_implementation_labs/master/resources/rhte/3scale-apicast.yml

Need to investigate as same ${THREESCALE_AMP_NAMESPACE} is replaced correctly for the BACKEND_ENDPOINT_OVERRIDE.