Support to retrieve parameter names from PluginConfig

Change-Id: Icf4e6ef4c68c32f692b64fe68835394053038e1c
Signed-off-by: Edwin Kempin <edwin.kempin@sap.com>
diff --git a/gerrit-server/src/main/java/com/google/gerrit/server/config/PluginConfig.java b/gerrit-server/src/main/java/com/google/gerrit/server/config/PluginConfig.java
index 4443200..27fcd72 100644
--- a/gerrit-server/src/main/java/com/google/gerrit/server/config/PluginConfig.java
+++ b/gerrit-server/src/main/java/com/google/gerrit/server/config/PluginConfig.java
@@ -149,4 +149,8 @@
   public void unset(String name) {
     cfg.unset(PLUGIN, pluginName, name);
   }
+
+  public Set<String> getNames() {
+    return cfg.getNames(PLUGIN, pluginName);
+  }
 }