plugin: Pass TerraformVersion from ConfigureRequest

[radeksimko]

As I was reading through the code and trying to understand where does the testing framework get Terraform version from I found that there are two places which are sourcing version, one of which seems redundant.

terraform/terraform/eval_context_builtin.go

Lines 179 to 182 in 75d3f1e

	req := providers.ConfigureRequest{
	TerraformVersion: version.String(),
	Config: cfg,
	}

I believe that this is just oversight and not a safeguard against callers of GRPCProvider.Configure which wouldn't declare Terraform version, but I'm happy to be corrected! 😄

A side effect of this change is that we'll now report pre-released versions too, i.e. custom built 0.12.7 from master will be reported as 0.12.7-dev, rather than simple 0.12.7.

[ghost]

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