Change the type of PdeathSignal
Change the type of PdeathSignal

Use x/sys as same as runtime/v1/linux/runtime.go

Signed-off-by: Kenta Tada <bfcbc6141feda87cbc58e846dfb8f4969098b30b@sony.com>

thaJeztah/containerd,dmcgowan/containerd,thaJeztah/containerd,dmcgowan/containerd,estesp/containerd,containerd/containerd,estesp/containerd,vdemeester/containerd,mikebrow/containerd,containerd/containerd,mikebrow/containerd,vdemeester/containerd