updated api-versions endpoint openapi: put common structure of path and referenced in other openapis

Updated API version resource, and Version HTTP Header - SOL002 #1,5,6,17,19,20,21,22,43,45,53,55,58,61,66,68

SOL002_57: Subscriptions GET body description updated, VNF Fault Management interface base path updated

SOL002_50: PerformanceReport updated and moved in SOL002SOL003VNFPerformanceManagement_def.yaml, refs updated

SOL002_32: VnfInfoModificationsRequest and VnfcInfoModifications added to SOL002SOL003VNFLifecycleManagement_def.yaml, ref updated in VNFLifecycleManagement.yaml

MonitoringParameter updated in SOL002SOL003VNFLifecycleManagement_def.yaml, MonitoringParameter removed from VNFLifecycleManagement_def.yaml and refs updated

VnfcResourceInfo removed from VNFLifecycleManagement_def.yaml, now ref to VnfcResourceInfo in SOL002SOL003VNFLifecycleManagement_def.yaml

AffectedVirtualLink updated in VNFLifecycleManagement_def.yaml and SOL002SOL003VNFLifecycleManagement_def.yaml