fix(integration): no spans in the future (jaegertracing#3538)

Signed-off-by: Johannes Würbach <johannes.wuerbach@googlemail.com>
Signed-off-by: Albert Teoh <see.kwang.teoh@gmail.com>

plugin/storage/integration/integration_test.go

@@ -327,10 +327,10 @@ func loadAndParseJSON(t *testing.T, path string, object interface{}) {
 func correctTime(json []byte) []byte {
 	jsonString := string(json)
 	now := time.Now().UTC()
-	today := now.Format("2006-01-02")
 	yesterday := now.AddDate(0, 0, -1).Format("2006-01-02")
-	retString := strings.Replace(jsonString, "2017-01-26", today, -1)
-	retString = strings.Replace(retString, "2017-01-25", yesterday, -1)
+	twoDaysAgo := now.AddDate(0, 0, -2).Format("2006-01-02")
+	retString := strings.Replace(jsonString, "2017-01-26", yesterday, -1)
+	retString = strings.Replace(retString, "2017-01-25", twoDaysAgo, -1)
 	return []byte(retString)
 }