ETSI Alignment - SO SOL003 plugin support to connect to external VNFMs

ETSI Alignment - SO SOL003 plugin support to connect to an external VNFM. 

• Leverage ETSI standards for VNF LCM in SO

• Build SO VNFM Adapter

• • Use SOL003 APIs (2.5.1) for VNF LCM

• • Support operations such as create, instantiate, grant, terminate, Delete, LCN subscription, LCN and VNF package management

• • Support of Query is deferred to El Alto
• Enhance SO BPMN workflows & recipes

• • VNF-level and VF-Module workflows, leveraging VNFM Adapter 
  • Support of VF-Module workflows are deferred to El Alto for scaling modeling issues. 

• • Passing VNF LCM requests to VNFM using VNFM Adapter
•  Provide VNF package management for VNFM (Stretch Goal; under investigation)