only register tables used by os-vif
only register tables used by os-vif

This change limits the tables registered in the native driver
to the set actully used by os-vif. This will shorten the inital
startup time and reconnection time if the ovs db connection is dropped.
as a result this will help mitigate bug #1929446 where on reconnection
the nova compute agent can stall until reconnection is completed.

Change-Id: I635dff2b4fcff905ca8f431eb7e928265200f92a
Partial-Bug: #1929446

openstack/os-vif