policycoreutils: gui: Start using Popen

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This patch looks good to me. acked.

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iEYEARECAAYFAlD+pvcACgkQrlYvE4MpobN25wCg2qVoFl5USiGb7ZwHYAoDKbx0 F8EAniCrGrRLBve0fPlOjLtQrTnCeZB4
=ohFc
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