bgpd: The default IP route not advertised with configured RD

bgpd: The default IP route not advertised with configured RD

When "default-originate ipv4" is configured, a type-5 route is installed in
the local node and advertised to the peer with auto-rd.

When the above was followed by configuring an RD in IP VRF, Type-5 are
generated for only the non-default routes.

Fixed this issue by withdrawing the default route with auto-rd and advertising
 the route with confiured RD.

Signed-off-by: Kishore Aramalla karamalla@vmware.com