Use event service post for shim events

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

linux/shim/client_linux.go

@@ -0,0 +1,10 @@
+// +build linux
+
+package shim
+
+import "syscall"
+
+var atter = syscall.SysProcAttr{
+	Cloneflags: syscall.CLONE_NEWNS,
+	Setpgid:    true,
+}