Support terminal resizing for exec/attach/run

Add support for terminal resizing for exec, attach, and run. Note that for Docker, exec sessions
inherit the environment from the primary process, so if the container was created with tty=false,
that means the exec session's TERM variable will default to "dumb". Users can override this by
setting TERM=xterm (or whatever is appropriate) to get the correct "smart" terminal behavior.

cmd/kubectl/app/kubectl.go

@@ -17,7 +17,7 @@ limitations under the License.
 package app
 
 import (
-	"os"
+	"github.com/docker/docker/pkg/term"
 
 	"k8s.io/kubernetes/pkg/kubectl/cmd"
 	cmdutil "k8s.io/kubernetes/pkg/kubectl/cmd/util"
@@ -28,6 +28,8 @@ WARNING: this logic is duplicated, with minor changes, in cmd/hyperkube/kubectl.
 Any salient changes here will need to be manually reflected in that file.
 */
 func Run() error {
-	cmd := cmd.NewKubectlCommand(cmdutil.NewFactory(nil), os.Stdin, os.Stdout, os.Stderr)
+	// need to use term.StdStreams to get the right IO refs on Windows
+	stdin, stdout, stderr := term.StdStreams()
+	cmd := cmd.NewKubectlCommand(cmdutil.NewFactory(nil), stdin, stdout, stderr)
 	return cmd.Execute()
 }