kube-hunter

Remove scapy usage (#500)

• removed arp and dns hunters usage due to it's violations of the scapy GPL2 license

• added installation of arp and dns hunters to Dockerfile

• added explicit new version to plugins in dockerfile installation

• ignore B020 flake8

Fix: Removed automatic import of handler object (#506)

• removed automatic import of handler object in events package and renamed handler.py to event_handler.py to solve name collision