Changes:
* Fix OpenBSD cpu.sh output to match others
* Fix OpenBSD df.sh output (no need for %% here)
* Do not use sudo or doas when running as root
* Use #!/usr/bin/env bash to support OpenBSD in run_nix_ta_commands
* Fix rsyslog example to trim whitespace in run_nix_ta_commands
* Add /usr/local/sbin:/usr/local/bin to PATH in run_nix_ta_commands
* Fix getting hour and minute for OpenBSD in run_nix_ta_commands
"08" shows up to printf as octal
* Support difference in OpenBSD logger command:
Requires modifying /etc/syslog.conf and setting facility in /etc/nix_ta.conf
