boot_timeout value not respected

[rpoovey]

Describe the bug
Setting boot_timeout, in boot.cfg, value to any amount of time doesn't apply

To Reproduce
Edit boot.cfg, in either web UI or vim directly, and set value to any other time amount... Save, restart container, and netboot a device. Boot timeout to local HDD is still 300 seconds.

Expected behavior
To have the boot timeout to local HDD count down change to value set in boot.cfg

Additional context
This appears to be have been addressed 4 years ago in #654 and the config option added to boot.cfg in #655