Werk #7978: Service labels can now be discovered

The discovery functions of Checkmk checks can now produce a collection of service labels together with the discovered services. This makes it possible for the check developer to mark the services of the discovered services which can then be grouped together in a flexible way.

The discovered service labels can be listed on the service discovery page of WATO by enabling them with the button "Show discovered labels".

These labels are attributes of the discovered service and will be handled exactly like them. They are discovered in one step and applied to the running configuration in the same way. The cluster handling is also equal.

How make my checks produce service labels?

Instead of producing a two element tuple of (item, parameters) to create a new service the discovery functions can now provide objects like this:

Service(
    item="Interface 213",
    parameters=None,
    service_labels=ServiceLabels(
        ServiceLabel(u"check_type", u"network_interface"),
        ServiceLabel(u"interface_type", u"uplink"),
    )
)

These objects can be returned / yielded like the tuples before. Both, the parameters and the service_labels are optional arguments.

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