Windows: afslogon.dll is not a file system interface

Windows: afslogon.dll is not a file system interface

Do not return a file system network type that corresponds
to a real file system inter since afslogon is in fact not
associated with a file system interface.  We can't return
WNNC_NET_NONE (0) because that prevents NPLogonNotify()
from being executed.  However, if we return an in use
file system value that can confuse the system when the
actual file system's network provider is also installed.

Reviewed-on: http://gerrit.openafs.org/5313
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>
(cherry picked from commit 9052974812e33d186613c31e318673f9268467c6)

Change-Id: I60bc66440b548c3901914df8193c3999c3388abc
Reviewed-on: http://gerrit.openafs.org/6801
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>