/usr/share/live/images/container-server/config/bootloaders/syslinux/live.cfg.in is in open-infrastructure-system-images 20161101-lts2-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 | label live-@FLAVOUR@
menu label ^Live (@FLAVOUR@)
menu default
linux @LINUX@
initrd @INITRD@
append @APPEND_LIVE@
label live-@FLAVOUR@-failsafe
menu label Live (@FLAVOUR@ failsafe)
linux @LINUX@
initrd @INITRD@
append @APPEND_LIVE_FAILSAFE@
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