GitLab

This sets mac address using ip set link mac.

for no_simbricks experiments

This changed a while ago in one of the refactoring steps so some of the scripts
were broken.

- adds description for netperf experiment
- reformat local.py
- reformat results/netperf.py

- classes ExpEnv and ExpOutput had to be moved to prevent circular imports
- reformat common.py

moved functions:
- create_basic_hosts()
- create_multinic_hosts()
- create_dctcp_hosts()

This enables qemu hosts to still run if KVM is not available, albeit
much slower.