#1427 - QueryCache should be cleared, if one of a dependent bean is updated

Initial work, does not include propagation across cluster.

src/main/java/io/ebeaninternal/api/SpiTransaction.java

@@ -101,6 +101,11 @@ public interface SpiTransaction extends Transaction {
    */
   String getId();
 
+  /**
+   * Return the start timestamp for the transaction (JVM side).
+   */
+  long getStartMillis();
+
   /**
    * Return true if this transaction has updateAllLoadedProperties set.
    * If null is returned the server default is used (set on ServerConfig).