Implements blueprint ipsec-vpn-reference
This patch implements reference driver implementation for VPNaaS.
The driver uses openswan to manage vpn connections.
Future work: Support ikepolicy and ipsec update
Support service type framework
Intelligent updating of resources
This commit adds jinja2 for requirements.txt for
generating cofig file.
Change-Id: I8c5ed800a71ca014dc7bdbb6a57c4f8d18fa82e0
bba99f29ad