display-manager-autologin.sh: add fluxbox support

Closes: #136 [via git-merge-pr]

dracut/vmklive/display-manager-autologin.sh

@@ -52,5 +52,7 @@ if [ -r ${NEWROOT}/etc/lxdm/lxdm.conf ]; then
         sed -e "s,.*session.*=.*,session=/usr/bin/startlxde," -i ${NEWROOT}/etc/lxdm/lxdm.conf
     elif [ -x ${NEWROOT}/usr/bin/startlxqt ]; then
         sed -e "s,.*session.*=.*,session=/usr/bin/startlxqt," -i ${NEWROOT}/etc/lxdm/lxdm.conf
+    elif [ -x ${NEWROOT}/usr/bin/startfluxbox ]; then
+        sed -e "s,.*session.*=.*,session=/usr/bin/startfluxbox," -i ${NEWROOT}/etc/lxdm/lxdm.conf
     fi
 fi