[WFLY-1379] Don't replace log4j appenders from the bootstrap logging

If log4j appenders were defined as custom handlers bootstrap logging configured them correctly, but adding them back via an operation resulted in a bug in the logmanager. See https://github.com/jboss-logging/jboss-logmanager/pull/19 for that fix.

The issue was the class name would never be the same since we wrap the log4j appender in a JUL handler. There is no need to replace the log4j appenders if everything matches.