Defines an entry in the tmnxOamVprnTrRTTable. The first two
index elements identify the tmnxOamTrCtlEntry that a
tmnxOamVprnTrRTEntry belongs to. The third index element
identifies an OAM trace route test run. The fouth, fifth and sixth
index elements select a single OAM 'vprnTraceRoute' reply.
The seventh index selects either the probe requestor's or
probe replier's route information. The eighth index selects
successive L3 route target entries contained in a specific
'vprnTraceRoute' requestor or probe reply route information.