Include the Environment-Deployment when announcing an AMI build

Otherwise, we see 3 edxapp AMI builds per gocd pipeline, but have
no idea which one is which.  Similar issue for IDAs where you get at
least 2 AMIs.

playbooks/continuous_delivery/create_ami.yml

@@ -116,7 +116,7 @@
       api: "{{ hipchat_url }}"
       token: "{{ hipchat_token }}"
       room: "{{ hipchat_room }}"
-      msg: "Finished baking AMI for: {{ play }} \n
+      msg: "Finished baking AMI for: {{ edx_environment }}-{{ deployment }}-{{ play }} \n
             AMI-ID: {{ ami_register.image_id }} \n
            "
     ignore_errors: yes