[rancid] nxrancid small suggestion/patch

[Deny IP Any Any]

In my environment, adding

        {'show environment fex all fan' => 'ShowEnv'},

to my nxrancid's  @commandtable yields valuable information about the
power supply health of my N2K FEXs; it may be a valuable addition to
others as well.

I can provide this trivial change in DIFF format if that would be preferred.


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