Werk #6895: hp_msa_volume: Use volume-name as item identifier

Previously the durable-id has been used as identifier of items for the check hp_msa_volume (and its sub checks io and df). The durable-id is not guaranteed to be unique for different controllers of a volume. This werk changes the unique identifier for items from durable-id to volume-name. As soon as a discovery is executed the hp_msa_volume check items appear with volume-name.

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