virtcontainers: don't use clone flags to start shim

shim is already started in a new namespace, hence it doesn't need
the clone flags to create a new namespace.

Signed-off-by: Julio Montes <julio.montes@intel.com>

virtcontainers/shim.go

@@ -191,15 +191,6 @@ func startShim(args []string, params ShimParams) (int, error) {
 		cmd.Stderr = os.Stderr
 	}
 
-	cloneFlags := 0
-	for _, nsType := range params.CreateNS {
-		cloneFlags |= ns.CloneFlagsTable[nsType]
-	}
-
-	cmd.SysProcAttr = &syscall.SysProcAttr{
-		Cloneflags: uintptr(cloneFlags),
-	}
-
 	var f *os.File
 	var err error
 	if params.Console != "" {
@@ -211,21 +202,21 @@ func startShim(args []string, params ShimParams) (int, error) {
 		cmd.Stdin = f
 		cmd.Stdout = f
 		cmd.Stderr = f
-		// Create Session
-		cmd.SysProcAttr.Setsid = true
-		// Set Controlling terminal to Ctty
-		cmd.SysProcAttr.Setctty = true
-		cmd.SysProcAttr.Ctty = int(f.Fd())
+		cmd.SysProcAttr = &syscall.SysProcAttr{
+			// Create Session
+			Setsid: true,
+			// Set Controlling terminal to Ctty
+			Setctty: true,
+			Ctty:    int(f.Fd()),
+		}
 	}
 	defer func() {
 		if f != nil {
 			f.Close()
 		}
 	}()
 
-	if err := ns.NsEnter(params.EnterNS, func() error {
-		return cmd.Start()
-	}); err != nil {
+	if err := cmd.Start(); err != nil {
 		return -1, err
 	}