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

- Ignore https certificate verification on dispatchers (484)
- Added correct exception handling for discovery of Metadata apis (488)
- Added MITRE documentation in README (485)

Feature: Changed vulnerability categories to support MITRE ATT&CK (474)

* Refactored all categories to the new MITRE attack matrix format
* Changed format of vulnerabilities table to display the mitre technique related to the vulnerability