tap-linux: Get features once and use it many times
Signed-off-by: NKusanagi Kouichi <slash@ac.auone-net.jp> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>
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Signed-off-by: NKusanagi Kouichi <slash@ac.auone-net.jp> Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com>