Assert that ChunkWriteTimouts are not raised
Assert that ChunkWriteTimouts are not raised

Follow up for change Ibbc89449e7878fc4215e47e3f7dfe4ae58a2d638
to add a test assertion that the ChunkWriteTimeout contexts are
exited without raising the timeout exception in
iter_bytes_from_response_part().

Change-Id: I6d323cb26779e457fb5940093a81b349b333a0af

psachin/swift,matthewoliver/swift,hurricanerix/swift,clayg/swift,psachin/swift,revoer/keystone-8.0.0,notmyname/swift,tipabu/swift,revoer/keystone-8.0.0,aerwin3/swift,openstack/swift,notmyname/swift,psachin/swift,tipabu/swift,smerritt/swift,larsbutler/swift,prashanthpai/swift,clayg/swift,swiftstack/swift,openstack/swift,aerwin3/swift,prashanthpai/swift,larsbutler/swift,openstack/swift,hurricanerix/swift,notmyname/swift,smerritt/swift,nadeemsyed/swift,redbo/swift,tipabu/swift,nadeemsyed/swift,psachin/swift,matthewoliver/swift,smerritt/swift,tipabu/swift,nadeemsyed/swift,notmyname/swift,hurricanerix/swift,smerritt/swift,redbo/swift,matthewoliver/swift,openstack/swift,swiftstack/swift,hurricanerix/swift,nadeemsyed/swift,clayg/swift,matthewoliver/swift,clayg/swift,swiftstack/swift