def delete_keyvault(access_token, subscription_id, rgname, vault_name):
    '''Deletes a key vault in the named resource group.

    Args:
        access_token (str): A valid Azure authentication token.
        subscription_id (str): Azure subscription id.
        rgname (str): Azure resource group name.
        vault_name (str): Name of the new key vault.

    Returns:
        HTTP response. 200 OK.
    '''
    endpoint = ''.join([get_rm_endpoint(),
                        '/subscriptions/', subscription_id,
                        '/resourcegroups/', rgname,
                        '/providers/Microsoft.KeyVault/vaults/', vault_name,
                        '?api-version=', KEYVAULT_API])
    return do_delete(endpoint, access_token)
Deletes a key vault in the named resource group.

    Args:
        access_token (str): A valid Azure authentication token.
        subscription_id (str): Azure subscription id.
        rgname (str): Azure resource group name.
        vault_name (str): Name of the new key vault.

    Returns:
        HTTP response. 200 OK.