Werk #15237: Deal with 'messed up' RRD files

In some particular update scenario, users would see a message about 'messed up' RRD files: "RRD files for host myHost [...] are messed up. Please restore them both from backup." This case is now properly handled.

Users which are affected by the issue can execute the initial command again to get this fixed.

Technical details: Older filesystem metrics have been created using the mount as metric name, leading to a lot of differently named metrics. We have since changed the metric name to the predictable (and reusable) name 'fs_used'. The migration failed in cases where for some reason both the old and the new metric are present. In this case we now create the artificial metric fs_used_renamed_legacy_records from the old values, which will be prepended to the new metric to provide the full history of RRDs.

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