Windows: add RDR_ExtAttributes

Add RDR_ExtAttributes to compute the file attributes for redirector
queries.   The attributes reported via the RDR interface need to be
different from the SMB interface because the SMB interface does not
support reparse points nor does it support DFSLinks.

Reviewed-on: http://gerrit.openafs.org/9611
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 a8599a126513548bac790a2cbe4cbd1153312ef5)

Change-Id: I5835f5f275c14e3d329ef98e80a432a5f44eda81
Reviewed-on: http://gerrit.openafs.org/9618
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
Windows: netbios name comparisons are case insensitive

When parsing the symlink target string to categorize it as AFS Symlink
or DFS Link, the comparison with the netbios name string must be case
insensitive.  Otherwise, symlinks are reported to the redirector as
DFS Links.  For the most part they will work since the AFS redirector
requesting MUP to Reparse the \\AFS path will call back into the AFS
redirector.  However, the attributes on symlinks to files will be wrong
as DFS Links can only be links to directories.

Reviewed-on: http://gerrit.openafs.org/9612
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 170bbbdb93df64d3657026e13aba26c40d93f51d)

Change-Id: I63d5e840f7dfeb34a1ee88d47c37d9c2be52a6d7
Reviewed-on: http://gerrit.openafs.org/9619
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>