[j-nsp] Graphing VCP Backplane

[Phill Jolliffe]

If you can find a counter for the vcp throughput then you can populate
the "utility mib" with the value and snmp poll and graph it.

http://www.juniper.net/techpubs/en_US/junos10.3/topics/task/operational/snmp-best-practices-utility-mib-using.html

That said for all I know there might be a enterprise mib you can poll
with VCP already. This would be easier than commit script / utility
mib hackery