def delete_keyvault_secret(access_token, vault_uri, secret_name):
endpoint = '<STR_LIT>'.join([vault_uri,<EOL>'<STR_LIT>', secret_name,<EOL>'<STR_LIT>', '<STR_LIT>'])<EOL>return do_delete(endpoint, access_token)<EOL>
Deletes a secret from a key vault using the key vault URI. 

    Args:
        access_token (str): A valid Azure authentication token.
        vault_uri (str): Vault URI e.g. https://myvault.azure.net.
        secret_name (str): Name of the secret to add.

    Returns:
        HTTP response. 200 OK.