add more logs

Author: sakthivelmanii

google-cloud-spanner/src/test/java/com/google/cloud/spanner/RetryOnInvalidatedSessionTest.java

@@ -220,7 +220,10 @@ public void setUp() throws InterruptedException {
     if (spanner == null
         || spanner.getOptions().getSessionPoolOptions().isFailIfSessionNotFound()
             != failOnInvalidatedSession) {
+      System.out.println("Recreating spanner instance");
       if (spanner != null) {
+        System.out.printf("Closing the spanner instance %s %s",
+            spanner.getOptions().getSessionPoolOptions().isFailIfSessionNotFound(), failOnInvalidatedSession);
         spanner.close();
       }
       SessionPoolOptions.Builder builder = SessionPoolOptions.newBuilder().setFailOnSessionLeak();