networking: use proper wrapper around ip command

Previously a subprocess calls were used to invoke the ip command. This is now replaced with a proper NetLink API calls wrapped in pyroute2 module.

Fixes #48 (closed).

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This is awesome, I like it! On my system old libswrap version took 35 seconds to execute all tests, new version based on namespace + subprocess took 45 seconds and this takes 40-41 seconds.

Besides speed improvement I very much like getting rid of parsing error messages, I do not want to image what would happen with non-english locale etc.

TODO:

• document new depedency

assigned to @sbalazik

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• ab332f3e - docs: document new `pyroute2` dependency

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resolved all threads

If you are done please un-assign the MR so I know I can merge it.

unassigned @sbalazik

merged

mentioned in commit ebb6d356