This commit makes several changes to the route_table code used to
populate tunnel_egress_iface.
- It removes name_table code from netdev-vport and puts it into
route-table.
- It no longer attempts to build the name_table dynamically by
listening to rtnetlink-link notifications. Instead it dumps the
entire table, and uses rtnetlink-link notifications to indicate a
re-dump is required.
- It forces rtnetlink-link notifications to re-dump the routing
table. This fixes an issue where bringing an interface down or
removing it altogether would not have the expected effect on
related tunnel_egress_ifaces.
This commit removes the rtnetlink-route module and replaces it with
a much simpler to use route-table module. The route-table uses
rtnetlink to maintain a routing table which may be used to query
the egress interface of particular addresses.
This commit also converts netdev-vport to use the new route-table
module.
