Fix setup wizard cases: update wizard may show erroneously,

crash/restart during install may result in installer not completed,
ensure the user may not get locked out if they've created an admin user
but not completed the installer

core/src/main/java/hudson/PluginManager.java

@@ -1193,7 +1193,6 @@ public abstract class PluginManager extends AbstractModelObject implements OnMas
                     }
 			updateCenter.persistInstallStatus();
                     jenkins.setInstallState(InstallState.INITIAL_PLUGINS_INSTALLING.getNextState());
-                    InstallUtil.saveLastExecVersion();
                 }
             }.start();
         }