Use registry alias to fetch providers

[findkim]

Uses the new registry namespace alias - to fetch providers from the registry. Registry returns with the appropriate provider source, if exists, and TF includes the returned namespace for user information on download. Currently, the registry only is configured to support the terraform-providers namespace for the - alias but may change in the future.

Prior to change

Initializing provider plugins...
- Checking for available provider plugins...
- Downloading plugin for provider "null" (1.0.0)...

Success

Provider Not Found
No error change here when a provider is not found within terraform.d/plugins or the registry.

[mildwonkey]

This all looks good to me!

[ghost]

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