构造Slf4jLogger时有bug

在使用org.slf4j.LoggerFactory.getLogger(String name)的返回值作为参数构造Slf4jLogger实例时，忽略了并发初始化日志的场景，当日志正在初始化过程中时，此时获取LoggerFactory实例为org.slf4j.helpers.SubstituteLoggerFactory，返回的logger实例将为org.slf4j.helpers.SubstituteLogger，**此时不应该抛出异常，返回的logger对象亦不应缓存起来**，下次等到logger初始化完成后，会返回正常logger实例。

Start at the Slf4jLogger constructor and inspect how it handles the logger returned by org.slf4j.LoggerFactory.getLogger(String name). Reproduce the initialization-time case involving SubstituteLoggerFactory and SubstituteLogger; done means no exception is thrown, the temporary logger is not cached, and a later lookup can return the initialized logger.

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