Reducing DEVICE_INFO payload size by avoiding unchanged properties.

[shagihan]

Purpose

Reduce the size of the device info payload by removing unchanged information comparing with the previously sent data.

Approach

In the android agent create a Map, Which is storing key-value pairs for the attributes contains in the response payload and store that object in the shared preference.
At the time device info payload build, Compare the new values with the previous one and if changed add that to the device_info payload.

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