The value of vRtrPimNgAFGenMdtDataJoinTlvPck specifies if packing of
MDT Join TLVs is enabled. If multiple Join TLVs are available at the
time they are transmitted, the TLVs are packed into a single UDP PDU
instead of sending each one in a separate UDP PDU. In scaling
scenarios, this packing makes more efficient use of packet buffers and
helps in better convergence. The default value is 'true'.