Werk #10123: Fixed race condition when changing host check command.

When the kind of a host check command was changed, e.g. from an active check to smart ping, there was a small time window for scheduling to go wrong. This resulted in endless log lines of the form "invalid command line '@foo' for bar", and the only way to resume normal operation was to restart the Checkmk Micro Core, reloading was not enough. This has been fixed.

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