Add driver-side OVO functions.
1. Remove hostname field in DriverDevice, because agent will set hostname together for drivers. 2. Add in_use field in DriverAttachHandle. 3. Add functions like list,create,destory for driver ovos. 4. Fix bugs of objects. 5. Remove deployable name global unique constrains. Change-Id: I6a646a38e7c1b7042bc27465e1d912e7ff643651
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