Correcting all go vet errors

contrib/submit-queue/github/github.go

@@ -336,5 +336,4 @@ func WaitForPending(client *github.Client, user, project string, prNumber int) e
 		glog.V(4).Info("PR is not pending, waiting for 30 seconds")
 		time.Sleep(30 * time.Second)
 	}
-	return nil
 }

contrib/submit-queue/jenkins/jenkins.go

@@ -42,7 +42,7 @@ type Build struct {
 type Job struct {
 	Result    string `json:"result"`
 	ID        string `json:"id"`
-	Timestamp int    `json:timestamp`
+	Timestamp int    `json:"timestamp"`
 }
 
 func (j *JenkinsClient) request(path string) ([]byte, error) {