'Given a list of resources, retrieve the default quotas set for
a tenant.
:param context: The request context, for access checks.
:param resources: A dictionary of the registered resource keys.
:param tenant_id: The ID of the tenant to return default quotas for.
:return: dict from resource name to dict of name and limit'

@staticmethod
def get_default_quotas(context, resources, tenant_id):

    return dict(((key, resource.default) for (key, resource) in resources.items()))
