Register SDS with MDM/SIO Cluster
        :param sdsObj: ScaleIO SDS object
        :return: POST request response
        :rtype: Requests POST response object

def registerSds(self, sdsObj, **kwargs):
        """
        Register SDS with MDM/SIO Cluster
        :param sdsObj: ScaleIO SDS object
        :return: POST request response
        :rtype: Requests POST response object
        """
        # Register existing SDS running SDS binary (need to be installed manually but not added to MDM)
        # 
        self.conn.connection._check_login()    

        response = self.conn.connection._do_post("{}/{}".format(self.conn.connection._api_url, "types/Sds/instances"), json=sdsObj.__to_dict__())
        return response