https://build.spring.io/browse/INT-MASTER-733
The Netty tries to load `netty-transport-native-epoll` too long, more
then 10 seconds we expect in the `AbstractStompSessionManager`, therefore
we end up having `StompConnectionFailedEvent` as a first event in the
queue channel for STOMP events.
* Increase connection wait timeout to `30 secs`, like it is in many other
places in Spring
* Provide some Java 8 style refactoring for the `AbstractStompSessionManager`
* Fix `StompServerIntegrationTests` to poll events from queue until
`StompSessionConnectedEvent` any way
* Upgrade to Gradle 4.0 and `spring-io-plugin-0.0.8`
* Bump `org.sonarqube` version to `2.5` - `2.1` isn't compatible with Gradle 4.0
a1c42f65d0