Use consistent naming for MistralRpcResponseTimeout
Use consistent naming for MistralRpcResponseTimeout

Before: MistralRPCResponseTimeout
After: MistralRpcResponseTimeout

Change-Id: I1fb16e6db72316dae7143e77c1508e7e091feb6a
Signed-off-by: Luke Short <75ade22b5a2100772de069dd66aee23213a7adc0@gmail.com>

openstack/tripleo-heat-templates,openstack/tripleo-heat-templates