+ tests/dynamips/test_hypervisor.py: Increase sleep time to prevent
random test failures
+ tests/iou/test_iou_device.py: Rework test skipping based on presence
of IOU image rather than environment variable
Dynamips working directory management
Random port selection for the ZeroMQ server
TCP & UDP port allocation in a range with improvements
Update Dynamips to 0.2.11 (for the tests)
Focus on Python3 development (stop trying to be compatible with Python
2.x)
More error/bug catching