Error calling sed on BSD systems

[dunderhay]

sed on BSD systems (such as macos in my case) do not handle parsing command-line arguments the same way as GNU sed.

When performing the rule de-duplication clean up -> Removing duplicate IPs/Networks on line 583, where sed is invoked as: sed -e ... -i <file> results in the following error on macos / most likely other BSD systems:

sed: -I or -i may not be used with stdin

This can be fixed by calling sed -i -e ... <file> instead.