* Feature + Test + Documentation: added no-auth ssh health cheack feature, changed documentation to fit new behavior, added ssh test cases.
* Refactor: refactored authenticate field to infer from username and password insted of specifying it inside config.
* Refactor: removed non used field.
* Refactor: changed error, removed spaces.
* Refactor: added comments.
* refactor: Partially break core package into dns, result and ssh packages
* refactor: Move core package to config/endpoint
* refactor: Fix warning about overlapping imported package name with endpoint variable
* refactor: Rename EndpointStatus to Status
* refactor: Merge result pkg back into endpoint pkg, because it makes more sense
* refactor: Rename parameter r to result in Condition.evaluate
* refactor: Rename parameter r to result
* refactor: Revert accidental change to endpoint.TypeDNS
* refactor: Rename parameter r to result
* refactor: Merge util package into endpoint package
* refactor: Rename parameter r to result
