[c-nsp] revert redundant sups to single sup720

[randal k]

So far, we have confirmed that there doesn't seem to be an easy-to-use CLI
way to remove redundancy. Of the (config-red)# commands, only
'linecard-group' works with a "no" prefix, all the others have no effect.
The best idea so far is to remove the redundancy part from the config or
confreg to blank and see if no mention in the configs makes it come up
redundant or not.

Any further input would be appreciated!

Randal

Anybody have any ideas on how to downgrade dual-sups to single sup?
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