Replaced xStorage references with the HQ StorageDsc dsc resource module

[TraGicCode]

Pull Request (PR) description
Replace references of xStorage with the renamed StorageDsc dsc resource module.

This Pull Request (PR) fixes the following issues:
Fixes #1038

Task list:

• Change details added to Unreleased section of CHANGELOG.md?
• Added/updated documentation, comment-based help and descriptions in .schema.mof files where appropriate?
• Examples appropriately updated?
• New/changed code adheres to Style Guidelines?
• Unit and (optional) Integration tests created/updated where possible?

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This change is 

[codecov-io]

Codecov Report

Merging #1056 into dev will not change coverage.
The diff coverage is n/a.

@@         Coverage Diff          @@
##            dev   #1056   +/-   ##
====================================
  Coverage    97%     97%           
====================================
  Files        32      32           
  Lines      3930    3930           
====================================
  Hits       3844    3844           
  Misses       86      86

[johlju]

Closing and reopening this PR to kick off the tests again since the tests seemed to have failed on a temporary error.

[johlju]

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Reviewed 4 of 4 files at r1.
Review status: all files reviewed at latest revision, all discussions resolved.

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Comments from Reviewable