Updated openstack/openstack
Project: openstack/nova  9a165b88cb522f2747fe1ad4605089ecb448a369
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Don't log stacktrace for UnexpectedTaskStateError

An UnexpectedTaskStateError is actually an expected behavior and we
don't need to log a stacktrace every time it happens. This stacktrace
is one of the most common ones found in nova-compute during gating jobs.

Change-Id: I8b33f72dc0f4beaca969de084481d66987faa974