CDI container is not available during shutdown

[tomas-langer]

When the container.close() is called, we may get an exception from HelidonContainerImpl that Container not running.

This is because we set the "not running" before finalizing the container work. One of the things it does is that it triggers events (such as Application scoped before destroyed event) that may in turn instantiate beans. If such a bean uses CDI.current(), it breaks.

To reproduce:

• create a bean that is not used by the application at all
• add the following method

  public void method(@Observes @BeforeDestroyed(ApplicationScoped.class) Object event) {
    CDI.current().getBeanManager()
  }

• start the container
• stop the container

The "stop" part should throw an exception as described above.
Correct behavior:
The CDI.current() should work (maybe we could issue a single warning with stacktrace, such as "container is shutting down, yet CDI was requested)