Pynetlib

Support of route configuration
- prohibit route
- unreachable route
- static route

Complete support of ip addr informations:
- Discover queuing disciplines
- Implement qlen discovery
- Deal with external namespaces
- Discover namespaces created outside 'ip netns' command
- Discover transmit queue length
- Discover maximum transmission unit

- External namespace discovery
- mtu device discovery
- fix packaging problems

Bugfix release:
- state was not discovered correctly
- Cleanup dependencies management