Fix race condition in IO test (TestNewAttach)
Fix race condition in IO test (TestNewAttach)

Signed-off-by: Lucas Molas <7764ff4bde8506dc1973b423d6b6e88628f555d4@fundacionsadosky.org.ar>

miaoyq/containerd,mikebrow/containerd,kunalkushwaha/containerd,containerd/containerd,thaJeztah/containerd,thaJeztah/containerd,crosbymichael/containerd,vdemeester/containerd,miaoyq/containerd,estesp/containerd,mikebrow/containerd,estesp/containerd,dmcgowan/containerd,containerd/containerd,vdemeester/containerd,crosbymichael/containerd,kunalkushwaha/containerd,dmcgowan/containerd