Implement non-kernel-module KBUS

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As a first step towards other things (particularly, the cross-network KBUS 
support), implement a user-space alternative to the KBUS kernel module.

The first implementation should probably be in Python, and should be able 
to use the same (or a subset of the same) unit tests as the Python 
bindings for the kernel module system.

A C version should then be relatively easy to produce, and this may form 
the basis for the networking infrastructure.

Original issue reported on code.google.com by [email protected] on 9 Nov 2009 at 11:49