Fix to advertise VRF routes from DC-GW

Fix to advertise VRF routes from DC-GW

VRF routes from DC-GW is not advertised
to ODL primary RDs

Previously, when some routes are advertised from DC-GW
to quagga. since it was imported by a wrong RD which is
not primary, destination prefix (advertised by DC-GW)
in vrf-entry of fib was under wrong RD.

This is fixed now by checking if RD equals primary RD
(while advertising routes to quagga bgp), then send
an import RTs list, otherwise send an empty list.

Change-Id: I268e5da85df2c1115ef1549b1ff97514d31b4f58
Signed-off-by: eswanit <swati.udhavrao.niture@ericsson.com>