F-558: Add missing paramters in OS section of VM template

[jaypif]

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Description

This PR adds support for missing OS section in VM template. It aligns the OS section with the Documentation:
https://docs.opennebula.io/6.10/management_and_operations/references/template.html?highlight=firmware#os-and-boot-options-section

A correct fix consist in updating GOCA OSVec structure to reflec the Documentation
A dedicated issue has bee openned in the Goca Repo: OpenNebula/one#6782

References

#558

New or Affected Resource(s)

• opennebula_XXXXX

Checklist

• I have created an issue and I have mentioned it in References
• My code follows the style guidelines of this project (use go fmt)
• My changes generate no new warnings or errors
• I have updated the unit tests and they pass succesfuly
• I have commented my code, particularly in hard-to-understand areas
• I have updated the documentation (if needed)
• I have updated the changelog file