'Get the lun ID for an exported volume.
If the lun is successfully assigned (exported) to a client, the
client info has the lun_id.
:param volume_name:  name of volume to query for lun ID
:param client_name:  name of client associated with the volume
:returns: Returns True if lun is ready, False otherwise'

def _is_lun_id_ready(self, volume_name, client_name):

    lun_id = (-1)
    lun_id = self._get_lun_id(volume_name, client_name)
    if (lun_id is None):
        return False
    else:
        return True
