fix for issue #121 in SOL005-NSD-Management

SOL005/NSDManagement-API/IndividualNSDescriptor.robot

SOL005/NSDManagement-API/IndividualPnfDescriptor.robot

SOL005/NSDManagement-API/IndividualSubscription.robot

SOL005/NSDManagement-API/NSD.robot

SOL005/NSDManagement-API/NSDArchiveContent.robot

SOL005/NSDManagement-API/NSDArchiveManifest.robot

SOL005/NSDManagement-API/NSDManagementKeywords.robot

SOL005/NSDManagement-API/NSDescriptors.robot

SOL005/NSDManagement-API/PNFD.robot

SOL005/NSDManagement-API/PNFDArchiveContent.robot

SOL005/NSDManagement-API/PNFDArchiveManifest.robot

SOL005/NSDManagement-API/PNFDescriptors.robot

SOL005/NSDManagement-API/Subscriptions.robot

.../NSDManagement-API/environment/individualSubscription.txt

SOL005/NSDManagement-API/environment/nsDescriptors.txt

SOL005/NSDManagement-API/environment/pnfDescriptors.txt

SOL005/NSDManagement-API/environment/subscriptions.txt

SOL005/NSDManagement-API/environment/variables.txt