Feature: Adds volume names to disk health plugin for easier understanding which disks are affected by certain thresholds

[LordHepipud]

Adds support for the disk health plugin to display not only the assigned driver letters to a disk but also the volume names.

\_ [OK] Disk #1 (All must be [OK])
   \_ [INFO] 1 Assigned Partitions: None
   \_ [INFO] 1 Assigned Volumes: TestVolume; TestVolume2
   \_ [INFO] 1 avg. disk queue length: 0%
   \_ [INFO] 1 avg. disk sec/read: 0us
   \_ [INFO] 1 avg. disk sec/transfer: 0us
   \_ [INFO] 1 avg. disk sec/write: 0us