WIP: iproute2 tools implementation

Hey Dan, had a few hours of concentration on this and had a bash - I'm not sure if the approach is sane: I capture the command params for each resource and then execute... e.g. i store "ip link add foo type dummy" for interface 'foo' and then invoke '/usr/sbin/ip for str.split('ip')[1]

anyway if useful pick it up from here or I will continue tomorrow with any comments and start thinking about tests.

thanks! marios