delete experimental object watcher

wip

Correctly return ErrNoMatch when rescheduling a check For some reason the API returns an internal server error status rather than a Not Found status (as in other methods in the API). We can catch the condition when results are empty and return ErrNoMatch.

Correctly return ErrNoMatch The check was incorrect before. The HTTP status on responses is still 200 OK, but with empty results if there are no matches to the filter.

Let users schedule their own checks

Implement checker interface for HostGroup This also adds a test for checking all hosts in a HostGroup.

Document checker Check() methods

Add checking of services and hosts And also add a icinga_test package that does the black-box tests i.e. tests which speak to a real icinga server.