Add bamboo. prefix to the SCDF_TIS_DOCKERHUB_XX env. variables

Author: tzolov

spring-cloud-dataflow-server/src/test/resources/docker-compose-it.yml

@@ -3,6 +3,6 @@ version: '3'
 services:
   dataflow-server:
     environment:
-      - SPRING_CLOUD_DATAFLOW_CONTAINER_REGISTRY_CONFIGURATIONS_DEFAULT_USER=${SCDF_ITS_DOCKERHUB_USER}
-      - SPRING_CLOUD_DATAFLOW_CONTAINER_REGISTRY_CONFIGURATIONS_DEFAULT_SECRET=${SCDF_ITS_DOCKERHUB_PASSWORD}
+      - SPRING_CLOUD_DATAFLOW_CONTAINER_REGISTRY_CONFIGURATIONS_DEFAULT_USER=${bamboo.SCDF_ITS_DOCKERHUB_USER}
+      - SPRING_CLOUD_DATAFLOW_CONTAINER_REGISTRY_CONFIGURATIONS_DEFAULT_SECRET=${bamboo.SCDF_ITS_DOCKERHUB_PASSWORD}