B-464: enable vm raw section

[treywelsh]

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Description

This PR add a raw section to the VM schema, and mutualize common code parts with the template resource. Some checks are added for the virtual machine to avoid defining sections like os, graphics, raw etc. via template_section. There's also a bit of refactoring to make the code a bit more easier to understand.

References

Close #464

New or Affected Resource(s)

• opennebula_virtual_machine
• opennebula_template

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

[treywelsh]

It seems I can't checks keys in vadition functions: template_section: ValidateFunc and ValidateDiagFunc are not yet supported on lists or sets I'll remove this check

[treywelsh]

This is not really a bug it's more a feature as I add new attributes in virtual machine resource