Updated openstack/openstack
Project: openstack/horizon  29d3210f3c11c75f3d25060b7f6875ba665b9be3

Re-raise exception using six

Using six.reraise() to re-raise an exception makes it compatible with
Python 2 and 3

Closes-Bug: 1351973
Change-Id: I11d1ce35794f2c6cfebafe5211ab8d880c4a826c