Update project to use a valid Go module name (terraform-provider-macaddress -> github.com/ivoronin/..)

[ddelnano]

Summary: Update project to use a valid Go module name (terraform-provider-macaddress -> github.com/ivoronin/terraform-provider-macaddress)

I am the maintainer for the terrform-provider-xenorchestra project and the end users of this project often pair our terraform providers together (VMs sometimes need a parameterized mac address). Unfortunately the xenorchestra provider has a bug where the intermediate state of a macaddress resource's output causes a crash (vatesfr/terraform-provider-xenorchestra#191, vatesfr/terraform-provider-xenorchestra#236). In order to address this bug, I wanted to embed this terraform provider into the xenorchestra acceptance test suite to verify the issue was fixed (see vatesfr/terraform-provider-xenorchestra#288).

In order to accomplish this, I had to fork your project and change the module name to include a domain prefix to avoid the error seen below:

ddelnano@ddelnano-desktop:~/code/terraform-provider-xenorchestra (master) $ git diff
diff --git a/go.mod b/go.mod
index eb90974..8f3397d 100644
--- a/go.mod
+++ b/go.mod
@@ -76,3 +76,4 @@ require (
 )

 replace github.com/ddelnano/terraform-provider-xenorchestra/client => ./client
+replace github.com/ivoronin/terraform-provider-macaddress v0.3.2 => terraform-provider-macaddress v0.3.2

ddelnano@ddelnano-desktop:~/code/terraform-provider-xenorchestra (master) $ go get github.com/ivoronin/terraform-provider-macaddress
go: github.com/ivoronin/terraform-provider-macaddress: malformed module path "terraform-provider-macaddress": missing dot in first path element

This change upstreams what I made in my fork to facilitate vatesfr/terraform-provider-xenorchestra#288.

Test plan: Existing acceptance tests pass and changes are consistent with my working fork

ddelnano@ddelnano-desktop:~/code/terraform-provider-macaddress (ddelnano/update-projects-module-name-to-be-valid) $ TF_ACC=1 go test ./... -v
?       github.com/ivoronin/terraform-provider-macaddress       [no test files]
=== RUN   TestProvider
--- PASS: TestProvider (0.00s)
=== RUN   TestProvider_impl
--- PASS: TestProvider_impl (0.00s)
=== RUN   TestAccMacAddress
--- PASS: TestAccMacAddress (2.01s)
PASS
ok      github.com/ivoronin/terraform-provider-macaddress/macaddress    2.019s

Also wanted to say thank you for your work on this project! I pair it with my xenorchestra terraform as well :)