Add Plugin web UI

Put a link under Admin to show the list of installed plugins

Signed-off-by: Brad Larson <bklarson@gmail.com>
Change-Id: I35d41fd49ed88dc17bdf5bed55e18299cb98f07f

gerrit-gwtui/src/main/java/com/google/gerrit/client/admin/AdminConstants.java

@@ -104,6 +104,12 @@ public interface AdminConstants extends Constants {
   String projectAdminTabBranches();
   String projectAdminTabAccess();
 
+  String plugins();
+  String pluginTabInstalled();
+
+  String columnPluginName();
+  String columnPluginVersion();
+
   String noGroupSelected();
   String errorNoMatchingGroups();
   String errorNoGitRepository();