kubelet: Add --exit-on-lock-contention flag

This patch adds the --exit-on-lock-contention flag, which must be used
in conjunction with the --lock-file flag. When provided, it causes the
kubelet to wait for inotify events for that lock file. When an 'open'
event is received, the kubelet will exit.

cmd/kubelet/app/server_test.go

@@ -17,8 +17,9 @@ limitations under the License.
 package app
 
 import (
-	"k8s.io/kubernetes/pkg/util/config"
 	"testing"
+
+	"k8s.io/kubernetes/pkg/util/config"
 )
 
 func TestValueOfAllocatableResources(t *testing.T) {