clean up X script and cron install

roles/cleanup_x/files/cleanup-x.sh

+#!/bin/bash
+
+# Grep to find out whether there's X process running and user logged in
+
+# Is Desktop running on this machine? Anything greater than 0 means yes
+DESKTOPRUNNING=`/opt/slurm-16.05.4/bin/squeue | grep desktop | grep -c $HOSTNAME`
+
+# Is X running? Anything greater than 0 means yes
+XRUNNING=`ps aux | grep "/usr/bin/X" | grep -c root`
+
+# This checks if no desktop is running but X is still there
+if [ "$DESKTOPRUNNING" == 0 ] && [ "XRUNNING" > 0 ]
+then
+        # Trying to get XPID
+	if [ -z "$XPID" ]
+	then
+		XPID=`ps -ef | grep "/usr/bin/X" | grep root | awk '{print $2}'`
+		kill $XPID > /dev/null 2>&1 
+        fi
+fi

roles/cleanup_x/tasks/main.yml

+---
+- name: Copy cleanup-x.sh to the server
+  copy:
+    src: cleanup-x.sh
+    dest: /usr/local/bin/cleanup-x.sh
+    mode: 0755
+    owner: root
+  sudo: true
+
+- name: Install cron job on VisNodes
+  sudo: true
+  cron:
+    name: Clean up X Check
+    special_time: hourly
+    job: /usr/local/bin/cleanup-x.sh  
+    user: root