Windows: IOCTL_AFS_GET_DEBUG_TRACE

Pemrit the active Debug Flags and Trace Configuration to be
queried by administrators.

Change-Id: Ida711c7c910df7fbd3218d78b525dbebffa3ddac
Reviewed-on: http://gerrit.openafs.org/9798
Reviewed-by: Peter Scott <pscott@kerneldrivers.com>
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 ff2a5fed4da67907cc86162553d3689db3a22c06)
Reviewed-on: http://gerrit.openafs.org/9867