Windows: NP AFSGetConnection retrieve AuthId sooner

When processing a network provider GetConnection requestion obtain
the Authentication Logon Session Id earlier in the function so that
it can be logged as part of subsequent trace messages.

Change-Id: Ifef7d2da44e0266683b93bc76f25ee825294062c
Reviewed-on: http://gerrit.openafs.org/10898
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Tested-by: Jeffrey Altman <jaltman@your-file-system.com>