Ensure we trigger another scheduleIdleCheck(); after killing the tracker

Author: tarnfeld

src/main/java/org/apache/hadoop/mapred/MesosTracker.java

@@ -115,6 +115,7 @@ public void run() {
         if (MesosTracker.this.idleCounter >= MesosTracker.this.idleCheckMax) {
           LOG.info("Killing idle tasktracker: " + MesosTracker.this.host);
           MesosTracker.this.scheduler.killTracker(MesosTracker.this);
+          scheduleIdleCheck();
           return;
         }