cvs-plugin part of fix for JENKINS-23234: jenkins cvs update hang when r...

ignore symlinks (when recursing) like the major cvs clients.
If you're wanting to print an exception, either user Logger.error, or print ex.getMessage(). Also don't include the issue ID in the output message (users generally wont care about the issue that the message was introduced for). I'd also question whether the code should be trying to handle this IOException or just throwing it - we don't know the state of the files so shouldn't continue to work on them.