[nsp] police and rate-limit command

[sthaug at nethelp.no]

> OSM on 76xx supports inbound traffic shaping.

In what sense does inbound traffic shaping make sense? Remember that the
traffic has already reached your box, and has already used the capacity
on the link to your box.

Oh yeah, http://www.cisco.com/warp/public/105/policevsshape.html says
explicitly,

"Shaping implies the existence of a queue and of sufficient memory to
buffer delayed packets, while policing does not. Queueing is an
outbound concept; packets going out an interface get queued and can be
shaped. Only policing can be applied to inbound traffic on an interface."

Steinar Haug, Nethelp consulting, sthaug at nethelp.no