Defines an entry in the tmnxOamMacPingL2MapTable. The first two
index elements identify the tmnxOamPingCtlEntry that a
tmnxOamMacPingL2MapEntry belongs to. The third index element
identifies a specific OAM test run. The fourth index element
selects the group of responses associated with a specific probe
attempt. The fifth index selects a single OAM 'macQuery' reply.
Note that in the case of a successful 'macQuery' reply there will
be only two row entries created per test run. However there may
also be one or more error replies. The sixth index selects a
single L2 mapping entry within a specific probe reply.