Comment 19 for bug 1466755

Reviewed: https://review.opencontrail.org/11884
Committed: http://github.org/Juniper/contrail-controller/commit/78b330848ca26bc84a5c3dbe86cc34698d1d5b39
Submitter: Zuul
Branch: R2.1

commit 78b330848ca26bc84a5c3dbe86cc34698d1d5b39
Author: Nischal Sheth <email address hidden>
Date: Thu Jun 18 23:28:20 2015 -0700

Add logic to import/un-import static routes upon instance add/delete

The code in RoutePathReplicator::[Join|Leave] triggers import and
cleanup of routes by scheduling walks of tables that have the import
target being added/deleted in their export target list.

This is not effective for static routes since static routes live in
tables that do not have the route targets assocaited with the static
routes.

The ideal fix would be to maintain a dependency list of static routes
for each route target.

Implement a simpler fix for now, which is to trigger notification of
all static routes when an import target is added/deleted to a table.
This should have acceptable performance since the number of static
routes is usually relatively small.

Maintain a list of non-empty StaticRouteMgrs in the BgpServer so that
we don't have to iterate through all RoutingInstances in order to walk
all static routes.

Change-Id: I559e014fd1fd001c5209dce8ab3e7564048889c7
Closes-bug: 1466755