"DHCP_FQDN" allows specifying a fully qualified domain name of the system
Previously, the `ifcfg` interface configuration files required that the "DHCP_HOSTNAME" directive was used to specify the hostname of the system. The new initscripts "DHCP_FQDN" directive now also allows specifying the fully qualified domain name of the system. This is a complement to the "DHCP_HOSTNAME" directive. In case both "DHCP_HOSTNAME" and "DHCP_FQDN" are specified, only "DHCP_FQDN" is used.