Add top level /config REST API

/config/server/ part is hard coded for now, but we may add more
config specific resource names later.

/config/server/capabilities retrieves the known server wide
capabilities list. The list has to be loaded dynamically from
the server to permit plugins to declare their own capabilities.

Change-Id: I83692bd021925d37659bfbc88b3e3b67b92c18c1

gerrit-server/src/main/java/com/google/gerrit/server/config/Module.java

@@ -0,0 +1,30 @@
+// Copyright (C) 2013 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.gerrit.server.config;
+
+import static com.google.gerrit.server.config.ConfigResource.CONFIG_KIND;
+import static com.google.gerrit.server.config.CapabilityResource.CAPABILITY_KIND;
+
+import com.google.gerrit.extensions.registration.DynamicMap;
+import com.google.gerrit.extensions.restapi.RestApiModule;
+
+public class Module extends RestApiModule {
+  @Override
+  protected void configure() {
+    DynamicMap.mapOf(binder(), CONFIG_KIND);
+    DynamicMap.mapOf(binder(), CAPABILITY_KIND);
+    child(CONFIG_KIND, "capabilities").to(CapabilitiesCollection.class);
+  }
+}