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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