DB: remove deprecation warnings for BASEV2
DB: remove deprecation warnings for BASEV2

This code was moved to neutron-lib. The community has had ample
time to integrate these changes.

Change-Id: I1f6b9989fa9d064e6a07d1034bfec6c4786cccd3

huntxu/neutron,mahak/neutron,noironetworks/neutron,mahak/neutron,noironetworks/neutron,eayunstack/neutron,eayunstack/neutron,openstack/neutron,openstack/neutron,huntxu/neutron,mahak/neutron,openstack/neutron