* INT-4376: Upgage to Log4J 2
JIRA: https://jira.spring.io/browse/INT-4376
* Deprecate Log4J 1.x components in favor of newly added
a `Log4j2LevelAdjuster` JUnit `@Rule`
* Update all the logging configuration to Log4J 2
* Polishing after testing
JIRA: https://jira.spring.io/browse/INT-4206
* Fix unnecessary dependency resolution in BOM module
* Fix `MessagingMethodInvokerHelper` to handle `$MockitoMock$` generated classed which isn't CGLib `Proxies` any more
* Provide fixes for test classes according upgrade to Mockito `2.5`
* Fix Ceckstyle do not allow static imports for deprecated Mockito classes