api/execution: remove ProcessID from rpc calls

Now that the shim handles all container's processes the system pid is
sufficient.

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

cmd/ctr/run.go

@@ -118,7 +118,7 @@ var runCommand = cli.Command{
 					break eventLoop
 				}
 
-				if e.ID == cr.Container.ID && e.PID == cr.InitProcess.ID {
+				if e.ID == cr.Container.ID && e.PID == cr.InitProcess.Pid {
 					ec = e.StatusCode
 					break eventLoop
 				}