vRtrLdpSessionStatsTable is a read-only table. The purpose of this
table is to keep statistical information about a single session
between an LDP entity and an LDP Peer.
Use of AUGMENTS clause implies a one-to-one dependent relationship
between the base table, vRtrLdpSessionTable, and the augmenting
table, vRtrLdpSessionStatsTable. This in effect extends the
vRtrLdpSessionTable with additional columns. Creation or deletion
of a row in the vRtrLdpSessionTable results in the same fate for
the row in the vRtrLdpSessionStatsTable.