Windows: Permit direct to service non-wildcard lookups

Windows: Permit direct to service non-wildcard lookups

The AFS redirector has required that directories be fully enumerated
when the directory object is opened.  This is a very expensive
operation involving large numbers of file server RPC round trips for
directories with tens of thousands of objects and those containing
symlinks.

This patchset delays directory enumeration for the last component
in a path until such time as dirctory data is requested by the
application.  If the request is for a non-wildcard pattern, the
service will be asked to provide the details for just the one required
object.

Delaying the directory enumeration improves performance for
GetFileAttributes[Ex], GetDiskFreeSpace[Ex], GetVolumeInformation,
and GetNamedSecurityInfo Win32 API calls.   In those cases it is
no longer necessary to enumerate the target directory at all.

Change-Id: I7ef2fbafff925697d8b40e56837ef53bfcc78542
Reviewed-on: http://gerrit.openafs.org/9118
Reviewed-by: Peter Scott <pscott@kerneldrivers.com>
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>