Shared producer(s) closed ahead of time if vertx is being shut down

[flukschander]

Version

4.X

Context

When creating a shared producer from a Verticle it should stay alive (aka not closed) till the Verticle close(..) method finished.
Currently shared producers register a shutdown hook with VertxInternal directly and therefore the producer is closed ahead of time.

Do you have a reproducer?

Testcase (and PR) here

Steps to reproduce

1. initiate vertx instance
2. deploy verticle
3. within verticle create shared consumer
4. close vertx
5. within the stop(Promise<Void> stopPromise) method of the verticle wait a few milliseconds to simulate finish processing currently in-flight-messages and try to send a message before completing the stop-promise
6. observer error messages