VKC-170: Update go-vcloud-director library

[arunmk]

Also fix up some issues detected during test run

Description

Please provide a brief description of the changes proposed in this Pull Request

• Update go-vcloud-director. Run test code and fix up warnings.

Checklist

• [X] tested locally
• [ ] updated any relevant dependencies
• [ ] updated any relevant documentation or examples

Testing Done

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Issue

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Fixes #

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This change is