* mig parallel_conf_util

* mig BuildInitialScope BuildScopeWithNewParallelDesc BuildScopeWithNewParallelConf

* add test of GetDeviceTagAndMachineDeviceIds

* mig GetOpConfSymbol

* fix BuildScopeWithNewParallelDesc input type error

* use TRY

* use symbol::Storage<OperatorConfSymbol>

* _NewOpKernelObject

* del comment
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