Overview:
Send l3vpn route from first ibgp through play.py.
Send route-target route with specific rt argument from previous route from second ibgp.
Expect l3vpn route on second ibgp.

Steps to reproduce:
1. Start odl with usual features:

feature:install odl-restconf odl-bgpcep-bgp odl-bgpcep-bgp-config-example

2. Configure 2 ibgp peers with 127.0.0.2 and 127.0.0.3 ips

./configure.py

3. Start play.py's

./start_play1.py
./start_play2.py

4. Send l3vpn route from first play, and than route-target route from second play

./send_route_from_play1.py
./send_route_from_play2.py

5. We should be able verify presence of l3vpn route on second ibgp (127.0.0.3) either in it's specific rib, or in play2.log there should be UPDATE message present.