update azure backend

templates/duplicity.cnf.j2

@@ -1,5 +1,9 @@
-{% if duplicity_backend == s3 -%}
+# Ansible generated
+{% if duplicity_backend == 's3' -%}
 export PASSPHRASE="{{ duplicity_s3_passphrase }}"
 export AWS_ACCESS_KEY_ID={{ duplicity_s3_access_key }}
 export AWS_SECRET_ACCESS_KEY={{ duplicity_s3_secret_key }}
+{% elif duplicity_backend == 'azure' %}
+export AZURE_ACCOUNT_NAME={{ duplicity_azure_account_name }}
+export AZURE_ACCOUNT_KEY={{ duplicity_azure_account_key }}
 {% endif %}