adding create_cname.yml

playbooks/edx-east/create_cname.yml

+# Creates a cname for a sandbox ec2 instance
+- name: Creates a CNAME
+  hosts: all
+  sudo: True
+  gather_facts: False
+  tasks:
+    - name: Add DNS name
+      local_action:
+        module: route53
+        overwrite: yes
+        command: create
+        zone: "{{ dns_zone }}"
+        type: CNAME
+        ttl: 300
+        record: "{{ cname }}"
+        value: "{{ sandbox }}"
+
+