[l3vpn_ecmp] Even after Deletion of second VM, the entries are not deleted from vpn route table

Topology
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3CSS, 1 DC-GW, 6 VMs, 2 each on each CSS.

Build used
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distribution-karaf-0.6.0-20170519.042001-5322.zip

Steps to repro
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1)Do the basic vxlan configuration for one CSS.
2)Configure mpls over gre.Check it is configured properly.
3)Form bgp neigborship between Controller and DC-GW and check check bgp neighborship.
4)Configure two VMs on CSS-1 using nova command, configure bgvpn update with one rd.Check whether it is advertised to DC-GW.
5)Check these VM entries updated in "show ip route" in vpn context.
6) Delete 1st VM on CSS-1 using nova delete command.
7) Check whether it is deleted from the ip route as well.
8) Delete 1st VM on CSS-1 using nova delete command.
9) Check whether it is deleted from the ip route as well. It is not deleted.
PF the logs attached.