Add validation to NSX-T form_factor parameter.

[fieldsta]

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Summary of Pull Request

Type of Pull Request

• [ ] This is a bug fix.
• [ ] This is an enhancement or feature.
• [ ] This is a code style/formatting update.
• [ ] This is a documentation update.
• [ ] This is a refactoring update.
• [x] This is a chore update
• [ ] This is something else. Please describe:

Related to Existing Issues

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Test and Documentation Coverage

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• [ ] Tests have been completed.
• [ ] Documentation has been added/updated.

Breaking Changes?

• [ ] Yes, there are breaking changes.
• [x] No, there are no breaking changes.

[fieldsta]

Adding validation for the form_factor parameter based on VMware documentation. https://developer.vmware.com/apis/vcf/latest/domains/

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