facts[‘2RE’] : designates if the device can support two RE, not that it has them
facts[‘RE_hw_mi’] : designates if the device is multi-instance-routing-engine
facts[‘model’] : product model
facts[‘serialnumber’] : serial number
NOTES:
if in a 2RE system, this routine will only load the information
from the first chassis item.
hostname, domain, and fqdn are retrieved from configuration data;
inherited configs are checked.