Switch "Updated" column to fixed width
Switch "Updated" column to fixed width

Since we're using iso format dates, we know it should be at most
10 chars wide.  Set the width to 10 to avoid wrapping on small
screens.

Change-Id: I854cde22cb1d7678834c4d2ccf423c859b895770

stackforge/gertty,aspiers/gertty,openstack/gertty