F #548: Add method, gateway, dns arguments for nics

[sk4zuzu]

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Description

VM/Template NIC vectors inherit method, gateway and dns arguments from VNETs and ARs (look here). Those are defnitely useful good-to-have things, we add them to the interface in this PR. 🙂

References

#548

New or Affected Resource(s)

• opennebula_virtual_machine

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

[github-actions]

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