As part of recent code cleanup activities, the controllerconfig
clone.py module was dropped. This update removes references to this
file from the comment blocks of the boot menu files grub.cfg and
centos.syslinux.cfg.
Change-Id: If2260c74f58a61481cf3ed7c7fbbe5ebb5292b00
Partial-Bug: 1834218
Signed-off-by: Don Penney <don.penney@windriver.com>