Werk #4294: statgrab_disk: Works now in the same way as other diskstat check plugins

Reconstructed statgrab_disk check plugin: {{read}} and {{write}} values will be handled in one service as in other diskstat check plugins. Moreover the check has a discovery rule within which you can specify whether a summary service or services for each disk are generated. Default is summary mode.

In order to make the new check plugin work you have to perform a re-discovery on the affected hosts.

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