'Destroy a firewall.
:param  firewall: Firewall object to destroy
:type   firewall: :class:`GCEFirewall`
:return:  True if successful
:rtype:   ``bool``'

def ex_destroy_firewall(self, firewall):

    request = ('/global/firewalls/%s' % firewall.name)
    self.connection.async_request(request, method='DELETE')
    return True
