Your current version is too old, this function has been changed or removed, try upgrading to the new rolling version.

Nope it hasn't, you skim read the bug report.

/opt/scripts/vyos/reset-router-config.pl is my script that executes commands over SSH to change the config.

Error output is here:

[??] Command  : /opt/vyatta/sbin/vyatta-cfg-cmd-wrapper load config.boot.sauron.master
/opt/vyatta/sbin/vyatta-cfg-cmd-wrapper: line 84: /vyos-load-config.py: No such file or directory

In commit 9e74ad7, line 84 in vyatta-cfg-cmd-wrapper was changed from:
exec ${vyatta_sbindir}/vyatta-load-config.pl "${@:2}"
to
exec ${vyos_libexec_dir}/vyos-load-config.py "${@:2}"

No where in vyatta-cfg-cmd-wrapper does it pull in the variable for ${vyos_libexec_dir}, but the old variable ${vyatta_sbindir} is defined at the top of the script on line 27:
export vyatta_sbindir=/opt/vyatta/sbin

You can try edit with sudo nano /opt/vyatta/sbin/vyatta-cfg-cmd-wrapper

after line 27, add command export vyos_libexec_dir=/usr/libexec/vyos

save and test script again

That did fix the issue. So how do I get that change in the main code?

$ /opt/scripts/vyos/reset-router-config.pl --debug
[--] Resetting VyOS router configuration...
[??] Connection vyos:[email protected] established successfully
[??] Command  : /opt/vyatta/sbin/vyatta-cfg-cmd-wrapper begin
[??] Command  : /opt/vyatta/sbin/vyatta-cfg-cmd-wrapper load /config/config.boot.sauron.master
[??] Loading configuration from '/config/config.boot.sauron.master'

[??] No configuration changes to commit.

[??] Command  : /opt/vyatta/sbin/vyatta-cfg-cmd-wrapper commit
[??] Command  : /opt/vyatta/sbin/vyatta-cfg-cmd-wrapper end
[OK] VyOS router configuration reset complete.

PR: https://github.com/vyos/vyatta-cfg/pull/65

Thanks!