Werk #15475: agent_vsphere: Fix the IPv6 address format

Component	Agent bakery
Title	agent_vsphere: Fix the IPv6 address format
Date	May 9, 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 2.2.0b8 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

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