Bind ReplicationConfig explicitly

Binding ReplicationConfig explicitly does not change Guice's default
behavior. We may still want to use this if we prefer our ReplicationModule
class to serve as an explicit manifest for the services it provides. Also,
in rare cases, Guice may be unable to validate a binding at injector
creation time unless it is given explicitly.

Please refer http://google-guice.googlecode.com/git/javadoc/com/google/inject/Binder.html

Change-Id: If3548b8b120fca634b833c358f7c8c89485049c8

src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationModule.java

diff --git a/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationModule.java b/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationModule.java
index f3609e5..4b3b730 100644
--- a/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationModule.java
+++ b/src/main/java/com/googlesource/gerrit/plugins/replication/ReplicationModule.java
@@ -32,6 +32,7 @@
 class ReplicationModule extends AbstractModule {
   @Override
   protected void configure() {
+    bind(ReplicationConfig.class);
     bind(ReplicationQueue.class).in(Scopes.SINGLETON);
 
     DynamicSet.bind(binder(), GitReferenceUpdatedListener.class)