instantiationState instead of nsState in InstantiateNSTask.robot 2.6.1

Expected property 'response body instantiationState' was not found.

https://forge.etsi.org/rep/nfv/api-tests/blob/2.6.1-fix-plu/SOL005/NSLifecycleManagement-API/NSLCMOperationKeywords.robot

Response body nsState should be used since instantiationState is not a property of NsInstance.

https://www.etsi.org/deliver/etsi_gs/NFV-SOL/001_099/005/02.06.01_60/gs_nfv-sol005v020601p.pdf

Edited Jun 11, 2020 by raducc

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