PluginConfigFactory: reload also outdated secure store

With refresh=true, the getFromGerritConfig method only checked
if gerrit.config was outdated and only reloaded the gerrit.config.
Reloading of an outdated secure.config didn't work.

If plugin stored a part of its configuration in the secure.config,
like the replication plugin did, then there was no way to reload
a changed username/password, without restarting Gerrit server.

Change-Id: I57b6dd4ba367fb23aa20dea3f5ac36d8fcf52e26

gerrit-pgm/src/test/java/com/google/gerrit/pgm/init/UpgradeFrom2_0_xTest.java

@@ -139,5 +139,15 @@ public class UpgradeFrom2_0_xTest extends InitTestCase {
     public Iterable<EntryKey> list() {
       throw new UnsupportedOperationException("not used by tests");
     }
+
+    @Override
+    public boolean isOutdated() {
+      throw new UnsupportedOperationException("not used by tests");
+    }
+
+    @Override
+    public void reload() {
+      throw new UnsupportedOperationException("not used by tests");
+    }
   }
 }