Correct the class equivalent judgement error
Correct the class equivalent judgement error

for n, f in six.iteritems(self.functions):
            if not isinstance(f, hot_funcs.Removed):
                self._parser_condition_functions[n] = function.Invalid
            else:
                self._parser_condition_functions[n] = f

In the above codes, "f" is a class ,not an instance, therefore isinstance is uncorrect.

Change-Id: I9ec41d19b77acf6e083b7c5cb5b779dc54b4e547

openstack/heat,noironetworks/heat,openstack/heat,noironetworks/heat