VPNaaS business definition update with 8 new chapters.

8 chapters have been added following previous discussions around VPNaaS, defined primitives and business vision shared by the management.

• The first version of VPNaaS with its features are almost set in stone if their definition is clarified and validated. They could be delivered soon.
• Features planned in the v.2 and v.3 still need to be discussed, properly defined, designed and planned.

The whole content is awaiting to be reviewed and commented.