ISCSIUIO: Removed the auto-generated COPYING file

The automake generated COPYING file in the iscsiuio folder
unintentionally suggested that the iscsiuio source might be
released as GPL licensed instead of the intended 4-clause BSD
license.

The patch is to remove the COPYING file.

Signed-off-by: Eddie Wai <eddie.wai@broadcom.com>