Disabling Boto/S3 querystring auth for edxapp

This removes the querystring at the end of the URLs for our content uploaded to S3.

ECOM-4081

playbooks/roles/edxapp/defaults/main.yml

@@ -42,6 +42,7 @@ EDXAPP_CMS_MAX_REQ: !!null
 # the configuration on disk
 EDXAPP_AWS_ACCESS_KEY_ID:  "None"
 EDXAPP_AWS_SECRET_ACCESS_KEY:  "None"
+EDXAPP_AWS_QUERYSTRING_AUTH: false
 EDXAPP_DEFAULT_FILE_STORAGE:  "django.core.files.storage.FileSystemStorage"
 EDXAPP_XQUEUE_BASIC_AUTH: [ "{{ COMMON_HTPASSWD_USER }}", "{{ COMMON_HTPASSWD_PASS }}" ]
 EDXAPP_XQUEUE_DJANGO_AUTH:
@@ -668,6 +669,7 @@ edxapp_generic_auth_config:  &edxapp_generic_auth
   DEFAULT_FILE_STORAGE:  "{{ EDXAPP_DEFAULT_FILE_STORAGE }}"
   AWS_ACCESS_KEY_ID:  "{{ EDXAPP_AWS_ACCESS_KEY_ID }}"
   AWS_SECRET_ACCESS_KEY: "{{ EDXAPP_AWS_SECRET_ACCESS_KEY }}"
+  AWS_QUERYSTRING_AUTH: "{{ EDXAPP_AWS_QUERYSTRING_AUTH }}"
   SECRET_KEY:  "{{ EDXAPP_EDXAPP_SECRET_KEY }}"
   DOC_STORE_CONFIG: "{{ edxapp_generic_doc_store_config }}"
   XQUEUE_INTERFACE: