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LCP: accept an auth nack to CHAP with length == 4

sthibaul requested to merge sthibaul/l2tpns:chap_nack into master

It seems at least some products send this:

{LCP (0xc021), length 12: LCP, Conf-Nack (0x03), id 9, length 10 encoded length 8 (=Option(s) length 4) 0x0000: c021 0309 0008 Auth-Prot Option (0x03), length 4: CHAP[|lcp]}

If we refuse to nack to CHAP, we'd stay stuck with PAP and eventually get a reject.

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