Refactor windows runtime

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

windows/process.go

@@ -0,0 +1,30 @@
+// +build windows
+
+package windows
+
+import (
+	"github.com/containerd/containerd"
+	"github.com/containerd/containerd/windows/hcs"
+	"golang.org/x/net/context"
+)
+
+// process implements containerd.Process and containerd.State
+type process struct {
+	*hcs.Process
+}
+
+func (p *process) State(ctx context.Context) (containerd.State, error) {
+	return p, nil
+}
+
+func (p *process) Kill(ctx context.Context, sig uint32, all bool) error {
+	return p.Process.Kill()
+}
+
+func (p *process) Status() containerd.Status {
+	return p.Process.Status()
+}
+
+func (p *process) Pid() uint32 {
+	return p.Process.Pid()
+}