Updated openstack/openstack
Project: openstack/swift  c72c10a1febbdc23e8e17a9eb3552e36ab46d02a
null
Preserve tracebacks from run_in_thread

Now the traceback goes all the way down to where the exception came
from, not just down to run_in_thread. Better for debugging.

Change-Id: Iac6acb843a6ecf51ea2672a563d80fa43d731f23