[l3vpn_ecmp] Karaf gets killed when multiple delete create operations of nova VM and bgvpn update done

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 router interface and recreate.
7) Remove bgpvpn update and re add using neutron bgpvpn delete command.
8)Delete 1st VM on CSS-1 using nova delete command.
9) Check whether it is deleted from the ip route as well.
10) Delete 2nd VM on CSS-1 using nova delete command.
Karaf is killed