Add net-mgmt/iprange

This tool is capable of managing sets of IPs.

Why to use iprange over any other aggregate ?

• simpler
• supports many input formats, all together in the same file
• faster, actually a lot faster (thanks to the original design by Gabriel Somlo)
• can compare files with IPs to find if they overlap and to what degree
• can find the IPs common to a set of files
• can exclude IPs (merge a set of files while excluding all IPs matched by another set of files)

WWW: https://github.com/firehol/iprange

MFH: 2017Q2
Sponsored by: Rubicon Communications (Netgate)