Fix AES key authentication

[NeffIsBack]

Hi :)

I needed AES authentication in manspider today and run into the problem that the authentication failed. This happens due to two logic flaws:

• Kerberos is not selected when an AES key is supplied
• The domain discovered in get_hostname is never used because self.domain is never populated

I have fixed both to get AES authentication working. Here a before&after of the authenticating with AES:

Note that I intentionally didn't query anything that would have been found by manspider to keep the output small.

[github-actions]

All contributors have signed the CLA ✍️ ✅
_{Posted by the CLA Assistant Lite bot.}

[NeffIsBack]

I have read the CLA Document and I hereby sign the CLA