Filter out duplicated network adapters on Windows

Change-Id: I19d4b91ea4fb6fcec6699ab6892ba1d6240919f6
Bug-Url: https://bugzilla.redhat.com/1113089
Signed-off-by: Vinzenz Feenstra <vfeenstr@redhat.com>
(cherry picked from commit f531f482a2b2fa03ba7ec61449f5c3539a607a03)