Refactor TableModState to use nanoTime refactor (#1720)

* #1719 - Refactor TableModState to use nanoTime

* Tests only - reduce logging

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

@@ -29,8 +29,8 @@ public abstract class SpiTransactionProxy implements SpiTransaction {
   }
 
   @Override
-  public long getStartMillis() {
-    return transaction.getStartMillis();
+  public long getStartNanoTime() {
+    return transaction.getStartNanoTime();
   }
 
   @Override