John McCann points out via bugzilla that iptables happily accepts this
syntax on DNAT/SNAT:

      --to x.x.x.x:y:z

but doesn't actually make use of the second port.  Clear up the confusion
by only accepting a dash between the ports.

This closes bugzilla #265.

Signed-off-by: Phil Oester <kernel@linuxace.com>
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