* Fix memory leak in MHistorConfig & MBeanExpHelper
The `MessageHistoryConfigurer` is a `BeanPostProcessor` which keeps a
store of the `TrackableComponent`.
Something similar we have with the `MBeanExporterHelper` and its local
stores populated by the `postProcessBeforeInitialization()`
* Implement `DestructionAwareBeanPostProcessor` in the
`MessageHistoryConfigurer` and `MBeanExporterHelper` to remove destroyed
beans from their caches
**Cherry-pick to 5.0.x**
* * Fix concurrency and checkstyle
* Apply Java 8 style for collections iterations
55a43d37c8