probe: Rewrite the hardware probe in python3

The rewritten probe also returns a json dictionary containing extra
information for use in templates.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>
munin: Simply the list of plugins

This uses the new hardware probe to return a dynamic list of network
interfaces and cleans up duplicate plugins between host and containers.

Signed-off-by: Stéphane Graber <stgraber@ubuntu.com>