Werk #13003: Migrate hitachi_hnas_volume.py to the new plugins API

Component	Checks & agents
Title	Migrate hitachi_hnas_volume.py to the new plugins API
Date	Jul 23, 2021
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

Hitachi volume plugin was to the new plugins API. The mount point groupings are working correctly now.

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