Guard against deleting entire filesystem in hack/test-go.sh
Guard against deleting entire filesystem in hack/test-go.sh

By failing if $coverage_output_dir is unset, we disallow
the directory string after `rm -rf` to begin with `/`.

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

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