Added support for UEFI booting to Network Booting configuration.
	modified:   conf.default/config.xml
	modified:   etc/inc/services.inc
	modified:   usr/local/www/services_dhcp.php
Merge branch 'master' of https://github.com/Doncuppjr/pfsense
Add missing option code for uefi booting
	modified:   etc/inc/services.inc
Put added option in dhcp config instead of dhcpv6 config.
Use empty function instead of <> "" for null test in dhcp network booting config section.
	modified:   etc/inc/services.inc
Merge pull request #992 from Doncuppjr/master

Add UEFI support to Network Boot options.