Adjustment on #1711, more explicit clearing of inactive transactions from thread local

src/test/java/io/ebeaninternal/api/TDSpiEbeanServer.java

@@ -227,6 +227,11 @@ public class TDSpiEbeanServer implements SpiEbeanServer {
 
   }
 
+  @Override
+  public void clearServerTransaction() {
+    
+  }
+
   @Override
   public SpiTransaction beginServerTransaction() {
     return null;