f-#: Adds a flag for debugging the provider

[aleixrm]

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Description

Adding a "--debug" flag and setting the ProviderAddr will allow us to easily debug the opennebula terraform provider using delve or VSCode, for instance.

Added documentation for debugging the provider and the tests through VSCode.

More info: https://developer.hashicorp.com/terraform/plugin/debugging#enabling-debugging-in-a-provider

References

#000

New or Affected Resource(s)

• opennebula provider

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

[sk4zuzu]

LGTM