[Dnsmasq-discuss] Bunch of small fixes in DHCPv6

[Ilya Ponetaev]

During my testing several issues were found in implementation of dhcpv6, 
so I submit here patch with the fixes.

Issues are:
- there is no need to check server-id matching for REBIND request as of 
ch. 15.7 RFC 3315
- when client tries to DECLINE with an unknown IAID that should not have 
a binding we must answer with 'success' result in global section anyway
- when client tries to CONFIRM with wrong address server must not send 
reply as of ch 18.2.2 RFC 3315
- possibly typo (?) in not setting reply type to DHCPREPLY sometimes 
leads to maiformed answer


-- 
Best regards,
Ilya Ponetaev
D-Link Corp.
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