Notify Attribute Change Requests return 400

Hello,

When using [Notify Attribute Change Request](https://console.ng.bluemix.net/docs/services/IoT/devices/device_mgmt/index.html#observations-notify) API, IOT server responds with 400.

here is my sample request response (using `client.setSerialNumber(“1234”)` in python) :
`ibmiotf.device.ManagedClient CRITICAL [400] Notify action failed: {“reqId”: “d2f22273-0289-4a44-acd8-092fb5cae331”, “d”: {“field”: “deviceInfo.serialNumber”, “value”: “1234”}}`

I am using 0.2.8 [iot-python/](https://github.com/ibm-watson-iot/iot-python/tree/0.2.8) device API. Other manage API’s seem to work (manage/location/error codes).

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