retrieve uuid from endpoint address, use it with service url as device id

[johnsonshih]

What this PR does / why we need it:
refs #250
This PR retrieve the Onvif device uuid and use it with service url to form the device id reported to Agent.

According to ONVIF core spec sec 7.3.1. The combination of an wsadis:Address
and wsadis:ReferenceProperties provide a stable and globally-unique identifier.

We can use "wsadis:Address + wsadis:ReferenceProperties.Address" as the identifier of Onvif devices. The DH needs to expose the uuid to brokers so brokers have the same information to uniquely identify a device.

7.3.1 Endpoint reference
A device or an endpoint that takes the client role should use a URN:UUID [RFC4122] as the address property
of its endpoint reference.
The device or an endpoint that takes the client role shall use a stable, globally unique identifier that is constant
across network interfaces as part of its endpoint reference property. The combination of an wsadis:Address
and wsadis:ReferenceProperties provide a stable and globally-unique identifier.

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[diconico07]

Will need a note in the release notes about the fact it changes the id of ONVIF devices I think.

[johnsonshih]

Will need a note in the release notes about the fact it changes the id of ONVIF devices I think.

sure, there will be follow up change for onvif DH w.r.t. the device id, I'll update the doc in one shot