Based on the detective work of Jianliang Lu <j.lu@tiesse.com>, allow yet

Based on the detective work of Jianliang Lu <j.lu@tiesse.com>, allow yet
another NTLMv2 combination.

We should allow the NTLMv2 response to be calculated with either the domain
as supplied, or the domain in UPPER case (as we always did in the past).

As a client, we always UPPER case it (as per the spec), but we also
make sure to UPPER case the domain, when we send it.  This should give
us maximum compatability.

Andrew Bartlett