title: Set BUILD_USER in Jenkins when the build process is time triggered
body: <p>I am using 'Build User Vars Plugin' in Jenkins to get the user that caused the trigger. This works fine when it's triggered manually. BUILD_USER is set to SCMTrigger when the build process is triggered by Polling P4 as well. However, when the build is triggered periodically(time), BUILD_USER is blank. Is there a way to set the BUILD_USER env variable when triggered by time? </p>