Get the lock status for a given resource.

        for security groups, parent id is their vpc.

def lock_status(self, resource_id, parent_id=None, account_id=None):
        """Get the lock status for a given resource.

        for security groups, parent id is their vpc.
        """
        account_id = self.get_account_id(account_id)
        params = parent_id and {'parent_id': parent_id} or None
        return self.http.get(
            "%s/%s/locks/%s" % (self.endpoint, account_id, resource_id),
            params=params, auth=self.get_api_auth())