Werk #15573: Detect all volumes with rstcli

Component	Checks & agents
Title	Detect all volumes with rstcli
Date	Oct 10, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

Previously, only one volume has been detected. This is fixed now. Thanks to thl-cmk for the contribution!

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