Description of problem:


There are over 200 ovs_lib tests failing in CI with the following error:

TypeError: Can't instantiate abstract class OvsdbVsctl with abstract methods db_find_rows, db_list_rows, db_remove


Version-Release number of selected component (if applicable): Latest OSP 12


How reproducible: 100%


Steps to Reproduce:
1. Clone neutron
2. Checkout OSP 12 branch
3. Run functional and/or unit tests

Actual results:

Traceback (most recent call last):
  File "neutron/tests/unit/agent/common/test_ovs_lib.py", line 93, in wrapper
    return f(*args, **kwargs)
  File "neutron/tests/unit/agent/common/test_ovs_lib.py", line 109, in setUp
    self.br = ovs_lib.OVSBridge(self.BR_NAME)
  File "neutron/agent/common/ovs_lib.py", line 195, in __init__
    super(OVSBridge, self).__init__()
  File "neutron/agent/common/ovs_lib.py", line 113, in __init__
    self.ovsdb = ovsdb_api.from_config(self)
  File "neutron/agent/ovsdb/api.py", line 57, in from_config
    return iface.api_factory(context)
  File "neutron/agent/ovsdb/impl_vsctl.py", line 33, in api_factory
    return OvsdbVsctl(context)
TypeError: Can't instantiate abstract class OvsdbVsctl with abstract methods db_find_rows, db_list_rows, db_remove


Expected results: Tests passed successfully