dasharo-compatibility/os-pfsense.robot: preseed test and boot time
test cases added
dasharo-compatibility/os-opnsense.robot: boot time measure tests
lib/bios/menus.py: Power state after AC loss added
lib/bsd.robot: new, separate file for installer OS & shell keywords
os-config/50*.py: OPNsense & pfSense prompts & credentials, incl.
installer
scripts/freebsd.preseed_opnsene.sh: license header added
Signed-off-by: Mateusz Maciejewski <mateusz.maciejewski@3mdeb.com>