tmnxOamEthCfmTrPrHistTable contains Ethernet CFM-specific probe
history for 'ethCfmLinkTrace' tests.
This table extends the tmnxOamTrProbeHistoryTable. A row is
automatically created in this table when a row is created in
tmnxOamTrProbeHistoryTable for a test with tmnxOamTrCtlTestMode set to
'ethCfmLinkTrace'. Deleting a row in tmnxOamTrProbeHistoryTable
automatically deletes the row (if any) with the same index values in
tmnxOamEthCfmTrPrHistTable.