[rancid] Nexus 9K support in RANCiD 3.7

[heasley]

Fri, Dec 29, 2017 at 11:00:36PM +0000, Charles T. Brooks:
> I like your patch better!  You might want to normalize the style in the previous line while you're in there - "&& next" instead of "next if".  I'm not a perl guru, though.

It is not the same as the other lines.  this code block filters the size
and timestamp, but leaves the name.  I suppose all of those filters could
be changed to this type of filter.  open to opinion.