[FIXED JENKINS-18970] Fixed bug in Windows
Fixed bug [JENKINS-18970]. The origin was the use of File.separator in String.split functions in util/Utils.java:616, which relays on Pattern.compile. In windows, File.separator provides a String which is an invalid regex expresion. By the use of Pattern.quote() function, the problem is solved.
Merge branch 'bugfix-JENKINS-18970'