B-283: fail on bad credentials

[treywelsh]

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Description

Fail on empty credentials.

References

Close #283

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

[frousselet]

Tested on my side. Now shows error as expected when using wrong parameters:

$ terraform plan

╷
│ Error: GOCA client error [REQUEST_HTTP]: http make request: Post "https://www.tata.net": dial tcp: lookup www.tata.net: no such host
│
│   with provider["ig1.com/ig1/opennebula"],
│   on main.tf line 10, in provider "opennebula":
│   10: provider "opennebula" {
│
╵

Missing changelog and we are good to merge.

[frousselet]

• Please add changes to CHANGELOG.md