qemu-iotests: replace FSF postal addresses with www.gnu.org links

Blue Swirl notices that we were using the old FSF post address in the
license boilerplates.  Replace both the old and new address with links
to the gnu.org licenses homepage as suggested by Ben Pfaff.

Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/tests/qemu-iotests/009 b/tests/qemu-iotests/009
index 00c1633..ebcc8de 100755
--- a/tests/qemu-iotests/009
+++ b/tests/qemu-iotests/009
@@ -15,9 +15,7 @@
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
-# along with this program; if not, write to the Free Software
-# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307
-# USA
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #
 
 # creator