'Method to be run by heat after stack operations, including failures.
On failure to execute all the registered pre_ops, this method will be
called if and only if the corresponding pre_op was successfully called.
On failures of the actual stack operation, this method will
be called if all the pre operations were successfully called.'

def do_post_op(self, cnxt, stack, current_stack=None, action=None, is_stack_failure=False):

    pass
