Windows: rdr pioctl operations are opaque

Windows: rdr pioctl operations are opaque

Although pioctl operations are delivered through the redirector the
contents of the operations are opaque to the redirector.  Therefore,
the cm_req must not be initialized as a redirector operation.  If they
are the necessary invalidation notifications for symlink and mount point
operations will not be delivered.

Change-Id: I48c2d89d2b2e0fc3f0ef56e7731108a8c51e1674
Reviewed-on: http://gerrit.openafs.org/12062
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@your-file-system.com>