Defines an entry in the tmnxOamTrHopsTable.
The first two index elements identify the tmnxOamTrCtlEntry
that a tmnxOamTrHopsEntry belongs to. The third index element
identifies a OAM trace route test run. The fourth index element,
tmnxOamTrHopsHopIndex, selects a hop in an Alcatel-Lucent SROS OAM
Trace Route path.