Propagate provider name into GRPCProviderPlugin

[alexsomesan]

This resolves the bellow error message printed on provider startup:

2022/02/02 01:07:48 [ERROR] Error parsing provider name "": Invalid provider source string: The "source" attribute must be in the format "[hostname/][namespace/]name"

[bflad]

This is a great catch, @alexsomesan! Thank you for fixing this. It looks like we don't have this issue in tf6server, so 🎉 there.

Could you also include a changelog entry? Something like the below in .changelog/150.txt would be great.

```release-note:bug
tfprotov5/tf5server: Prevent empty provider address error logs on startup
```

Thanks again!

[bflad]

I discovered through testing hashicorp/terraform-plugin-sdk#857, we also need to pass Opts: opts through there as well, otherwise acceptance testing logging does not constrain the protocol logging by default. I'm going to pull this in (with the changelog entry) and separately work on that issue, hopefully with some unit testing.

[alexsomesan]

Thanks for doing my work for me and adding the change-log entry. Got sidetracked and completely forgot about it.

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