Fix the build (#1256)

* Fix the build

Currently, building fails with the following error:

```
server/log_operation_manager.go:342: Verbose.Infof format %d has arg
logID of wrong type string
``

This is because logID is a string, but Infof is being asked to format it
as an integer.

* Add a test for LogOperationManager's OperationLoop

server/log_operation_manager.go

@@ -339,7 +339,7 @@ loop:
 		if runner == nil {
 			continue
 		}
-		glog.V(1).Infof("cancel election runner for %d", logID)
+		glog.V(1).Infof("cancel election runner for %s", logID)
 		runner.Cancel()
 	}
 	glog.Infof("wait for termination of election runners...")

server/log_operation_manager_test.go

@@ -20,6 +20,7 @@ import (
 	"fmt"
 	"reflect"
 	"strconv"
+	"sync/atomic"
 	"testing"
 	"time"
 
@@ -179,6 +180,42 @@ func TestLogOperationManagerPassesIDs(t *testing.T) {
 	lom.OperationSingle(ctx)
 }
 
+func TestLogOperationManagerOperationLoopPassesIDs(t *testing.T) {
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+
+	logID1 := int64(451)
+	logID2 := int64(145)
+
+	var logCount int64
+
+	ctrl := gomock.NewController(t)
+	defer ctrl.Finish()
+
+	fakeStorage, mockAdmin := setupLogIDs(ctrl, map[int64]string{451: "LogID1", 145: "LogID2"})
+	registry := extension.Registry{
+		LogStorage:   fakeStorage,
+		AdminStorage: mockAdmin,
+	}
+
+	mockLogOp := NewMockLogOperation(ctrl)
+	infoMatcher := logOpInfoMatcher{50}
+	mockLogOp.EXPECT().ExecutePass(gomock.Any(), logID1, infoMatcher).Do(func(_ context.Context, _ int64, _ *LogOperationInfo) {
+		if atomic.AddInt64(&logCount, 1) == 2 {
+			cancel()
+		}
+	})
+	mockLogOp.EXPECT().ExecutePass(gomock.Any(), logID2, infoMatcher).Do(func(_ context.Context, _ int64, _ *LogOperationInfo) {
+		if atomic.AddInt64(&logCount, 1) == 2 {
+			cancel()
+		}
+	})
+
+	info := defaultLogOperationInfo(registry)
+	lom := NewLogOperationManager(info, mockLogOp)
+	lom.OperationLoop(ctx)
+}
+
 func TestHeldInfo(t *testing.T) {
 	ctx := context.Background()
 	ctrl := gomock.NewController(t)