Report the index state after re-indexing

If indexing goes wrong, the failure is typically logged. But we do
not explicitly say when re-indexing gave a ready index. One has
to resort to double-checking `index/gerrit_index.config` the index
state after every re-index. So, we now explicitly report the index
state after re-indexing.

Change-Id: Idbf8c728a33e2753ee7528dc76f6095f407d3a05

java/com/google/gerrit/pgm/Reindex.java

@@ -208,6 +208,9 @@ public class Reindex extends SiteProgram {
     if (result.success()) {
       index.markReady(true);
     }
+    System.out.format(
+        "Index %s in version %d is %sready\n",
+        def.getName(), index.getSchema().getVersion(), result.success() ? "" : "NOT ");
     return result.success();
   }
 }