BGP neighbor only receives update for the first route sent

This issue is seen in stable/helium using the BGP application peer:

ODL <----> XRv

To reproduce:

• Stablish BGP session to XRv router
• Add a route in RIB using POST example in wiki
• Check route in XRv
• Delete route in ODL using DELETE or add another route using POST
• route still in XRv (no UPDATE message in wireshark)

BR/Luis