exabgp unable to connect after leader change - peer singleton service closed just after initialization

https://jenkins.opendaylight.org/releng/view/bgpcep/job/bgpcep-csit-3node-periodic-bgpclustering-ha-only-boron/25/

after the leader is killed, new leader is elected. In this case the new leader is node2. From the logs we see that peer singleton service is closed just after initialization and this is causing that exabgp cannot connect.

https://logs.opendaylight.org/releng/jenkins092/bgpcep-csit-3node-periodic-bgpclustering-ha-only-boron/25/archives/odl2_karaf.log.gz

2016-09-22 02:39:32,258 | INFO | lt-dispatcher-20 | RIBImpl | 285 - org.opendaylight.bgpcep.bgp-rib-impl - 0.6.1.SNAPSHOT | RIB Singleton Service ServiceGroupIdentifier

{value=Uri [_value=example-bgp-rib]-service-group} instantiated
2016-09-22 02:39:32,529 | INFO | lt-dispatcher-20 | BgpPeer | 285 - org.opendaylight.bgpcep.bgp-rib-impl - 0.6.1.SNAPSHOT | Peer Singleton Service ServiceGroupIdentifier{value=Uri [_value=example-bgp-rib]-service-group}

instantiated
2016-09-22 02:39:32,534 | INFO | on-dispatcher-52 | BgpPeer | 285 - org.opendaylight.bgpcep.bgp-rib-impl - 0.6.1.SNAPSHOT | Close Peer Singleton Service ServiceGroupIdentifier

{value=Uri [_value=example-bgp-rib]-service-group}