Add support for OVS Peer + Buf Fixes

1. Pass host-name in case of InitGenerator
2. Fix UT memory leak
Merge pull request #6 from manishsing/psethi_openvswitch

Scons to compile openvswitch library.
Change to make VRF Entry refer to the VN

Add UT for VRF Entry reference to VN
Merge pull request #7 from manishsing/Tables

Add support for OVS Peer + Buf Fixes
initial ovsdb change