B: keepalive probably not send from odl and Conflicting modification

job: https://jenkins.opendaylight.org/releng/view/bgpcep/job/bgpcep-csit-1node-periodic-bgp-ingest-mixed-only-boron/208/

logs:https://logs.opendaylight.org/releng/jenkins092/bgpcep-csit-1node-periodic-bgp-ingest-mixed-only-boron/208/archives/karaf.log.gz

play.py tool started to advetize 1M routes. After the hold timer expired on the play.py side, the connection was over.
Them various exceptions appeared in the karaf.log

2016-08-16 02:30:41,849 | WARN | ult-dispatcher-4 | ShardDataTree | 173 - org.opendaylight.controller.sal-distributed-datastore - 1.5.0.SNAPSHOT | member-1-shard-default-operational: Store Tx member-1-datastore-operational-fe-0-chn-23-txn-76656: Conflicting modification for path /(urn:opendaylight:params:xml:ns:yang:bgp-rib?revision=2013-09-25)bgp-rib/rib/rib[

{(urn:opendaylight:params:xml:ns:yang:bgp-rib?revision=2013-09-25)id=example-bgp-rib}

]/peer/peer[

{(urn:opendaylight:params:xml:ns:yang:bgp-rib?revision=2013-09-25)peer-id=bgp://10.29.12.188}

].

016-08-16 02:30:41,850 | ERROR | lt-dispatcher-36 | LocalThreePhaseCommitCohort | 173 - org.opendaylight.controller.sal-distributed-datastore - 1.5.0.SNAPSHOT | Failed to prepare transaction member-1-datastore-operational-fe-0-chn-23-txn-76656 on backend
OptimisticLockFailedException

{message=Optimistic lock failed., errorList=[RpcError [message=Optimistic lock failed., severity=ERROR, errorType=APPLICATION, tag=resource-denied, applicationTag=null, info=null, cause=org.opendaylight.yangtools.yang.data.api.schema.tree.ConflictingModificationAppliedException: Node was deleted by other transaction.]]}