[PATCH] support preferred network

[Gu, Yang]

Hi,
	This feature is to support operator preferred network and user preferred network. Operator preferred network is readonly, while user preferred network is readwrite. A corresponding test script is also added, and you can use it like: ./test-preferred-network 'UserPreferredNetworks' '10001' '10002' '10003'.


Regards,
-Yang


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