[dhcwg] Order of occurence of DHCPv6 options

I think, we need to fix the order of options occuring in DHCPv6 messages
for better processing of the messages.

1. Elapsed Time option - Since based on this value only, the relay/server is
going to decide the policy of reply.

2. Status Code - In the case of Failure, this message can be directly
ignored

3. Authentication option - If authentication fails, nothing is needed to
be processed.

4. server-id - If the server id doesn't match, server can ignore it.

5. client-id - If the client id doesn't match, client can ignore it.

6. Rapid commit - Based on this, the server can determine whether it need
to send Advertise or Reply.

If any of these options are occuring, then they MUST occur in this order.

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ConfNoMatch and AddrUnavail are nowhere used. It can be removed.

AuthFailed is also nowhere used. We need to add text saying if the
server/client is not able to authenticate the other, then they
should send reply with error code AuthFailed set.

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R-forw.    *                        *     *      *      *
R-repl.    *                        *     *      *      *

Why Authentication, User class, Vendor class, Vendor specific options
are needed in Relay-fwd and Relay-reply message.

~Vijay

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