misc/184117: dhclient does not parse /etc/dhclient.conf correctly

[Lowell Gilbert]

Making all options work with the "option-nnn" syntax would best be done
by importing a newer version of the ISC code. For defined option types,
it's better to use the official names because that way type handling is
enabled as well.

The user-class option is not in the dhcp_option_default_priority_list
array in sbin/dhclient/tables.c. Adding it (DHO_DHCP_USER_CLASS_ID) will
make the user-class option work. I.E.:

--- tables.c.~1~    2013-11-20 09:52:25.521743815 -0500
+++ tables.c        2013-11-20 09:53:33.733663843 -0500
@@ -365,6 +365,7 @@
	DHO_INTERFACE_MTU,
	DHO_ALL_SUBNETS_LOCAL,
	DHO_BROADCAST_ADDRESS,
+        DHO_DHCP_USER_CLASS_ID
	DHO_PERFORM_MASK_DISCOVERY,
	DHO_MASK_SUPPLIER,
	DHO_ROUTER_DISCOVERY,