Remove shadowed variable checks from vetting script
Remove shadowed variable checks from vetting script

Shadowed variable detection for the `go tool vet` tooling remains in
experimental state and development does not seem to be active on the
tool. Furthermore, no active work has been undertaken to remove the
existing shadowing in this codebase. The check is mostly useless,
therefore, and just iterates over the blacklist every time and flakes
once in a while. It therefore provides negative value and should simply
be removed.

Signed-off-by: Steve Kuznetsov <a7da0fca91d9933d2725d731a48cabdc9e8ffd7a@redhat.com>

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