HPCC-31073 Fix IStoragePlane hosts when plane based on 'hostGroup'

[jakesmith]

A plane based on a hostGroup was not being expanded correctly when a IStoragePlane was constucted.
As a consequence, use of a IStoragePlane based on a hostGroup had no hosts, and was being treated as if it was a non-host based plane that was locally mounted.

Type of change:

• This change is a bug fix (non-breaking change which fixes an issue).
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• This change fixes warnings (the fix does not alter the functionality or the generated code)
• This change is a breaking change (fix or feature that will cause existing behavior to change).
• This change alters the query API (existing queries will have to be recompiled)

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Testing:

[jakesmith]

@wangkx - please test and review

[github-actions]

https://track.hpccsystems.com/browse/HPCC-31073
Jira not updated (user does not match)

[wangkx]

@jakesmith the change looks fine. I did a test in my local environment with a dropzone not in localhost and the WsFileIO/ReadFileData works now.