Windows: foo.backup -> foo.backup too many symlinks

Windows: foo.backup -> foo.backup too many symlinks

In the case where an explicit mount point to a .backup volume is
resolved from a .backup volume the cache manager refuses to evaluate
the mount point target.  This is meant to address unwanted recursion
in the directory tree searches.

Change the error code to ERROR_TOO_MANY_SYMLINKS and propagate that
error to the AFS redirector.  That will result in the application
receiving STATUS_ACCESS_DENIED instead of
STATUS_REPARSE_POINT_NOT_RESOLVED.

The STATUS_REPARSE_POINT_NOT_RESOLVED error causes cmd.exe and
powershell.exe to terminate recursive directory searches.

Change-Id: I5dfdd835e8696b823af45a8e5c33a5ca6320cf31
Reviewed-on: http://gerrit.openafs.org/11693
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>