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.

pkg/kubectl/cmd/exec_test.go

@@ -32,6 +32,7 @@ import (
 	"k8s.io/kubernetes/pkg/api/unversioned"
 	"k8s.io/kubernetes/pkg/client/restclient"
 	"k8s.io/kubernetes/pkg/client/unversioned/fake"
+	"k8s.io/kubernetes/pkg/util/term"
 )
 
 type fakeRemoteExecutor struct {
@@ -40,7 +41,7 @@ type fakeRemoteExecutor struct {
 	execErr error
 }
 
-func (f *fakeRemoteExecutor) Execute(method string, url *url.URL, config *restclient.Config, stdin io.Reader, stdout, stderr io.Writer, tty bool) error {
+func (f *fakeRemoteExecutor) Execute(method string, url *url.URL, config *restclient.Config, stdin io.Reader, stdout, stderr io.Writer, tty bool, terminalSizeQueue term.TerminalSizeQueue) error {
 	f.method = method
 	f.url = url
 	return f.execErr