vRtrLdpTargTable keeps information about the export and import
prefixes for a targeted LDP session.
Use of AUGMENTS clause implies a one-to-one dependent
relationship between the base table, vRtrLdpGeneralTable,
and the augmenting table, vRtrLdpTargTable. This in
effect extends the vRtrLdpGeneralTable with additional
columns. Creation or deletion of a row in the
vRtrLdpGeneralTable results in the same fate for the row
in the vRtrLdpTargTable.