Comment 16 for bug 1279000

Lars, see https://review.openstack.org/#/c/75865/ That should allow migrations to continue for Icehouse without forcing utf8.

Unfortunately there's a lot of potential complexity around converting tables to utf8 so the Glance team doesn't want to add that this late in the cycle. This is a temporary workaround and hopefully we can come up with a permanent solution in Juno.