title: How to change the concurrent build path separator in Jenkins
body: <p>When marking a job as able to run concurrently on the same node, Jenkins will append a @X (where X is the number of the concurrent build) to the normal workspace directory to get a new, unique workspace directory.  Normally, this is all fine and good, but we've encountered a couple tools that cannot handle a @ in the path name even though the operating system can.</p>
  
  <p>Is there some way to change the @ character to something else?  Say maybe a double underscore (__) or something?</p>