Add multi-release for 2.x

After upgrading to log4j2, we're getting WARNING: sun.reflect.Reflection.getCallerClass is not supported. This will impact performance.. This kills async and pipes because the warning is written to stdout at least in the sub process. Adding multi release fixes this problem.

                  <manifestEntries>
                    <Multi-Release>true</Multi-Release>
                  </manifestEntries>