The Supported SAP List received in the capabilities
exchange message from the partner DLSw. This list has
the same format described for ciscoDlswTConnConfigSapList.
A string of zero length is returned before a Capabilities
Exchange message is received, or if one is never received.
If an implementation chooses to keep ciscoDlswTConnOperEntrys in
the `disconnected' state, this value should remain unchanged.