DCD-224: Add fetching of EC2 metadata and generation of EFS mount from it.

roles/aws_metadata/tasks/main.yml

@@ -0,0 +1,8 @@
+---
+
+# This role is primarily intended to be depended on via `meta` by
+# roles that need runtime information available.
+
+- name: Fetch local EC2 metadata
+  ec2_metadata_facts:
+