This patch introduces and integrates OVO for L3 HA Router.
Co-Authored-By: Nguyen Phuong An <AnNP@vn.fujitsu.com>
Co-Authored-By: Vu Cong Tuan <tuanvc@vn.fujitsu.com>
Change-Id: I3463921dec415dd073503ab9470588193d08ce87
Partially-Implements: blueprint adopt-oslo-versioned-objects-for-db