Windows: afslogon !KA_USERAUTH_AUTHENT_LOGON

Patchset 305133cde60fec7fb1050caf60a4319cdcf88a27 halted the practice
of calling ka_UserAuthenticateGeneral2() with the alternate smbName.
It should have halted the practice of passing flag
KA_USERAUTH_AUTHENT_LOGON which indicates that the smbName parameter
has been provided.   Passing KA_USERAUTH_AUTHENT_LOGON without the smbName
field results in a KTC_INVAL error.

This error only impacts sites that still use kaserver or Kerberos v4 for
authentication.

Reviewed-on: http://gerrit.openafs.org/9318
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 1c4e7ddb498f86b232f0f1de1f40690e97bf6a65)

Change-Id: I0d2c23b2a7baf07f0e2b74479a665742e67c0cfa
Reviewed-on: http://gerrit.openafs.org/9319
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>