vRtrPimNgDataMtThdTable configures Multicast Data Tunnel(Data MT)
thresholds for group prefixes.
Whenever the threshold of a C-(S,G)'s exceeds the configured threshold
value specified by vRtrPimNgDataMtThd in this table, a MT interface is
created in vRtrPimNgDataMtTable. If the data-threshold goes
below the value specified by vRtrPimNgDataMtThd, the MT
interface is automatically deleted.