Accurate reporting of output counters for MLFR UNI NNI bundles

The multilink frame relay (MLFR) UNI NNI bundle statistics section of the show interfaces lsq-interface statistics command output. From this release on, Junos OS also provides per-DLCI counters for logical interfaces. In earlier releases, there was a discrepancy between the actual output counters and the reported value because of errors in calculating the output counters at the logical interface level. That is, at the logical interface level, the output counter was calculated as the sum of frames egressing at the member links instead of roviding the output counter as the sum of per-DLCI output frame