Werk #8309: Fix authorization settings for seeing service in the user interface

The behaviour of the authorization setting loose for hosts has been changed to be compatible with the behaviour Nagios has. If host authorization is set to loose in the global settings of the Check_MK Micro Core, then it is now suffient to be the contact of a host for seeing all of its service - even if those services do have explicit contacts assigned. Formery you needed to be an explicit contact if one had been set. In the case that you just have contacts assigned to hosts nothing has changed.

The behaviour of the authorization setting strict has also changed. If you are the explicit contact of service, but not of the host, then you are allowed to see the service.

Note: This all has no impact on notifications. Nothing has changed there.

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