Issues: https://github.com/alibaba/arthas/milestone/8?closed=1
#848 Support user data report
#870 fix logger load Helper class from parent ClassLoader problem
#865 logger command support log4j2
#862 logger command print AsyncAppender blocking info
Issues: https://github.com/alibaba/arthas/milestone/8?closed=1
#848 支持用户数据回报
#870 修复logger可能加载到parent ClassLoader里的Helper类的问题
#865 logger command support log4j2
#862 logger command print AsyncAppender blocking info