create resource api performance Qa network subnet port serialized paralleled execute case 1: 1000 create network serialized case 2: 1000 create network concurrent executed case 3: 100 create subnet serialized case 4: 100 create subnet concurrent executed case 5: 1000 create port serialized case 6: 1000 create port concurrent executed 2016.1.22 1, merge create network operation and paralleled to create network