New module: iproute2

[costasd]

This changeset introduces a new module, called iproute2, based on the Interface module, that enables testing of different network parameters through the use of different iproute2 tools, such as the ip family of tools or bridge.

Right now, the following are supported and exposed through relevant methods:

• ip-address
• ip-link
• ip-route
• ip-rule
• ip-vrf
• ip-tunnel
• ip-netns
• bridge vlan
• bridge link
• bridge fdb
• bridge mdb

Furthermore, execution can be optionally contained into a specific family (inet or inet6) or a particular namespace.

Relevant tests and documentation for each of these methods is included with the module code.

[costasd]

:wave: Not sure if you'd prefer an accompanying issue with this PR - happy to if needed - Thanks!