Perf test 100K flow installation does not always work in Cluster

Basic flow installation is not working in boron. Refer below regression report.

https://jenkins.opendaylight.org/releng/view/openflowplugin/job/openflowplugin-csit-3node-periodic-bulkomatic-clustering-daily-only-boron/97/robot/

Steps where it is failing:

openflowplugin-bulkomatic-clustering-daily.txt.Cluster HA Data Recovery BulkFlow 2Node Cluster.Verify Flows In Switch Before Cluster Restart
Tags:
Message:
Keyword 'MininetKeywords.Mininet Sync Status' failed after retrying for 1 minute 40 seconds. The last error was: '*** s1 ------------------------------------------------------------------------
OFPST_AGGREGATE reply (OF1.3) (xid=0x2): packet_count=0 byte_count=0 flow_count=0
mininet>' contains 'flow_count=1000' 0 times, not 1 time.
no 0:01:41.536 2
openflowplugin-bulkomatic-clustering-daily.txt.Cluster HA Data Recovery BulkFlow 2Node Cluster.Verify Flows In Switch Before Follower Restart
Tags:
Message:
Keyword 'MininetKeywords.Mininet Sync Status' failed after retrying for 1 minute 40 seconds. The last error was: '*** s1 ------------------------------------------------------------------------
OFPST_AGGREGATE reply (OF1.3) (xid=0x2): packet_count=0 byte_count=0 flow_count=0
mininet>' contains 'flow_count=1000' 0 times, not 1 time.

Scenario Execution Step:
==========================

1. Get Inventory Follower and Leader information

2. Start Mininet Connect To Follower Node1

3. Add Bulk Flow ( 1000 flows )From Follower Node1

4. Get Bulk Flows and Verify In Cluster config DS all flows are installed

5. Verify Flows In Switch , The test is failing in this step. no flows seen in OVS switch.

Attached the follower node1 karaf logs