Get the list of subdomains owned by an address.
        Return {'status': True, 'subdomains': ...} on success
        Return {'error': ...} on error

def rpc_get_subdomains_owned_by_address(self, address, **con_info):
        """
        Get the list of subdomains owned by an address.
        Return {'status': True, 'subdomains': ...} on success
        Return {'error': ...} on error
        """
        if not check_address(address):
            return {'error': 'Invalid address', 'http_status': 400}

        res = get_subdomains_owned_by_address(address)
        return self.success_response({'subdomains': res})