Bind OnlineReindexer.Factory in LuceneIndexModule

The OnlineReindexer.Factory is only bound in MultiVersionModule.

This causes some of the acceptance tests to fail with the error
"no implementation bound" because the SingleVersionModule is being
used, which does not bind OnlineReindexer.Factory.

Bind it in LuceneIndexModule instead, so it's used in both cases.

Change-Id: I6df22bb405621485e5dcba2a5d0e0a14de372f8a

gerrit-lucene/src/main/java/com/google/gerrit/lucene/LuceneIndexModule.java

@@ -46,6 +46,7 @@ public class LuceneIndexModule extends LifecycleModule {
   protected void configure() {
     bind(IndexConfig.class).toInstance(IndexConfig.createDefault());
     factory(LuceneChangeIndex.Factory.class);
+    factory(OnlineReindexer.Factory.class);
     install(new IndexModule(threads));
     if (singleVersion == null && base == null) {
       install(new MultiVersionModule());
@@ -57,7 +58,6 @@ public class LuceneIndexModule extends LifecycleModule {
   private class MultiVersionModule extends LifecycleModule {
     @Override
     public void configure() {
-      factory(OnlineReindexer.Factory.class);
       listener().to(LuceneVersionManager.class);
     }
   }