Fix ctr run for Windows containers

1. Fixes bugs in ctr run that were introduced by 1d9b969
2. Adds support for the --isolated flag that runs Windows HyperV
cotainers instead of process isolated containers on Windows.

Signed-off-by: Justin Terry (VM) <juterry@microsoft.com>

cmd/ctr/commands/run/run.go

@@ -106,6 +106,10 @@ var Command = cli.Command{
 			Name:  "fifo-dir",
 			Usage: "directory used for storing IO FIFOs",
 		},
+		cli.BoolFlag{
+			Name:  "isolated",
+			Usage: "run the container with vm isolation",
+		},
 	}, append(commands.SnapshotterFlags, commands.ContainerFlags...)...),
 	Action: func(context *cli.Context) error {
 		var (