Lists all of the Floating IPs available on the account.

def all_floating_ips(self):
        """
        Lists all of the Floating IPs available on the account.
        """
        if self.api_version == 2:
            json = self.request('/floating_ips')
            return json['floating_ips']
        else:
            raise DoError(v2_api_required_str)