Add new tests to presubmit, fix errors

perf/go/alerting/alerting.go

 package alerting
 
 import (
         "database/sql"
         "encoding/json"
         "fmt"
         "math"
         "net/http"
         "strconv"
         "time"
@@ skipping 117 matching lines @@
         ret := []*types.ClusterSummary{}
 
         for rows.Next() {
                 var body string
                 var id int64
                 if err := rows.Scan(&id, &body); err != nil {
                         return nil, fmt.Errorf("Failed to read row from database: %s", err)
                 }
                 c := &types.ClusterSummary{}
                 if err := json.Unmarshal([]byte(body), c); err != nil {
-                        glog.Errorf("Found invalid JSON in clusters table: %s %s", id, err)
+                        glog.Errorf("Found invalid JSON in clusters table: %d %s", id, err)
                         return nil, fmt.Errorf("Failed to read row from database: %s", err)
                 }
                 c.ID = id
                 glog.Infof("ID: %d", id)
                 ret = append(ret, c)
         }
 
         return ret, nil
 }
 
@@ skipping 224 matching lines @@
 
 // Start kicks off a go routine the periodically refreshes the current alerting clusters.
 func Start(tileStore types.TileStore, apiKeyFlag string) {
         apiKey := apiKeyFromFlag(apiKeyFlag)
         go func() {
                 for _ = range time.Tick(config.RECLUSTER_DURATION) {
                         singleStep(tileStore, apiKey)
                 }
         }()
 }