Windows: FilePhysicalNameInfo query AFS prefix

Windows: FilePhysicalNameInfo query AFS prefix

In response to the FilePhysicalNameInformation query the AFS redirector
failed to include the server name in the response.  Since the constructed
name is the same as the FileNameInformation query create a helper function
AFSGetFullFileName() to populate the file name into the provided buffer
and use it to satisfy both queries.

Reviewed-on: http://gerrit.openafs.org/11488
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>
(cherry picked from commit 70f67371e7fb6262d43874950107864f31f903c9)

Change-Id: I326eccff9d7329657238698f946becdd17f40499
Reviewed-on: http://gerrit.openafs.org/11502
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>