* refactor nxos_vrf_interface * refactor nxos_vrrp * refactor nxos_vtp_domain * refactor nxos_vtp_password * refactor nxos_vtp_version * refactor nxos_vxlan_vtep
* fixes for 27600 27676 * add sanity tests
* fix issues with python3.x * Add integration testa and fix for nxos_evpn_vni * add nxos_evpn_vni to nxos.yaml * fix get_vtp_config() * add new integration tests * fix rollback * add integration test files