Multiple runs results in multiple `/v2/`s appending to paths

[jacobbednarz]

While attempting the V2 upgrade, I ran tf-sdk-migrator v2upgrade and hit some issues to fix. As the output wasn't entirely clear, I ran it again after fixing the issues resulting in paths that duplicated the v2/ portion of the module name.

--- cloudflare/data_source_zone_dnssec.go
+++ cloudflare/data_source_zone_dnssec.go
@@ -6,7 +6,7 @@ import (
        "log"

        "github.com/cloudflare/cloudflare-go"
-       "github.com/hashicorp/terraform-plugin-sdk/helper/schema"
+       "github.com/hashicorp/terraform-plugin-sdk/v2/v2/helper/schema"
 )

This wasn't too problematic to fix however it was unexpected and thought I'd document the issue for others.

The usage path I followed probably wasn't correct however perhaps a warning that the v2/ rewrite had already happened and either halt or skip would be useful?