[patch] udhcpc RFC-compliance

[Jonas Danielsson]

Hello,

The udhcp client currently does not follow RFC2131
(http://www.ietf.org/rfc/rfc2131.txt) when sending DHCPDECLINE and 
DHCPRELEASE
messages.

The send_decline function in clientpacket.c includes the Parameter request
list in the packet, something the RFC tells us that we MUST NOT do.
Also send_decline neglects to include the Requested ip address and the
Server identifier.

The function init_packet, also in clientpacket.c, always includes the
Vendor class identifier even tho the RFC tells us that we MUST NOT include
it in DHCPDECLINE or DHCPRELEASE messages. And send_release currently 
includes
the Requested IP address something we MUST NOT do.

The attached patch fixes this. It's against the daily snapshop of 20080118.

Regards
Jonas Danielsson
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