Proper support for "/32" IP addresses in remote files.

[helgihg]

An IP range with a mask of /32 is just a single IP address. The IP address 123.123.123.123 is therefore the same thing as 123.123.123.123/32.

RIFC gets a little confused by this and spouts output such as:

Adding IP 157.55.204.1/32... done
Adding IP 157.55.204.33/32... done
Removing IP 157.55.204.1... done
Removing IP 157.55.204.33... done

This does not seem to have an effect on functionality, but it should not be spouting such nonsense without reason.