kubelet_test: Add verifyUnorderedCalls().

This fixes TestSyncPodsDeletesWithNoPodInfraContainer.
Since we need to sync two pods in parallel, we should not verify
the docker calls in strict order.

pkg/kubelet/dockertools/fake_docker_client.go

@@ -19,6 +19,7 @@ package dockertools
 import (
 	"fmt"
 	"reflect"
+	"sort"
 	"sync"
 	"time"
 
@@ -66,6 +67,23 @@ func (f *FakeDockerClient) AssertCalls(calls []string) (err error) {
 	return
 }
 
+func (f *FakeDockerClient) AssertUnorderedCalls(calls []string) (err error) {
+	f.Lock()
+	defer f.Unlock()
+
+	var actual, expected []string
+	copy(actual, calls)
+	copy(expected, f.called)
+
+	sort.StringSlice(actual).Sort()
+	sort.StringSlice(expected).Sort()
+
+	if !reflect.DeepEqual(actual, expected) {
+		err = fmt.Errorf("expected(sorted) %#v, got(sorted) %#v", expected, actual)
+	}
+	return
+}
+
 // ListContainers is a test-spy implementation of DockerInterface.ListContainers.
 // It adds an entry "list" to the internal method call record.
 func (f *FakeDockerClient) ListContainers(options docker.ListContainersOptions) ([]docker.APIContainers, error) {