* added basic metrics server discovery
* improved discovery, and added KNOWN PORTS usage
* improved apiserver decision
* fixed bug with comparison of IP addresses in kubeservicehost
* improved description of api server discovery
* added checks with auth_token on discovery
* fixed bug in version requests and added to tests
* added an abstract 'unrecognized API' event, and a filter for it for classification
* changed filtering to be done on the same event
* fixed verify on session and removed unnecessary enum
* minor changes to comments
* added detailed explanation