Add more outputs to Redis cluster module

The module now exports the following attributes:

- configuration_endpoint_address
- id (new)
- primary_endpoint_address (new)
- port (new)

modules/data-stores/elasticache-redis-cluster/outputs.tf

@@ -3,6 +3,18 @@
  * Outputs.
  */
 
+output "id" {
+  value = "${aws_elasticache_replication_group.redis_replication_group.id}"
+}
+
 output "configuration_endpoint_address" {
   value = "${aws_elasticache_replication_group.redis_replication_group.configuration_endpoint_address}"
 }
+
+output "primary_endpoint_address" {
+  value = "${aws_elasticache_replication_group.redis_replication_group.primary_endpoint_address}"
+}
+
+output "port" {
+  value = "${aws_elasticache_replication_group.redis_replication_group.port}"
+}