[CLEANUP]: Moved CheckStyle URLs to point at Jenkins vs GitHub

GitHub is returning an empty document for suppressions.xml, this may be because every time a checkstyle Ant target is run, we download that file (and pentaho_checkStyle.xml) and they are throttling access.  To avoid this, I created a CI job to keep the latest artifacts:

http://ci.pentaho.com/job/pentaho-coding-standards/

This pull request is to change the URLs to point at the artifacts from the CI job rather than the raw GitHub URLs.