Update Get-IcingaClusterSharedVolumeData.psm1

[PatrickHees]

This pull request resolves the dependency between clustered shared volume and shared disk in the "Invoke-IcingaCheckClusterSharedVolume" check.

The following constellations were then tested with the adjustment:

Clustered Shared Volumes and Shared Disk
Both are properly monitored

Clustered shared volumes only
Only the clustered shared volumes are monitored.

Shared disk only
Only the shared disks contained in the cluster are monitored.

Neither Cluster Shared Volumes nor Shared Disk
The check has the status "unknown" in Icinga because neither cluster shared volumes nor shared disks were found.

This pull request corresponds to support case #784384.

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[bobapple]

@cla-bot check

[cla-bot]

Thank you for your pull request. Before we can look at it, you'll need to sign a Contributor License Agreement (CLA).

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[bobapple]

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[PatrickHees]

CLA was signed by me.

[LordHepipud]

Thanks!