Elan Service suite start test fails to obtain Ip Addresses for VMs from DHCP Agent

Elan Service start suite fails to obtain ip addresses of VMs from DHCP.

As a result, test cases after the start-suite all of them had to fail.

The CSIT report here;
https://jenkins.opendaylight.org/releng/job/netvirt-csit-1node-openstack-newton-nodl-v2-gate-stateful-carbon/196/robot/report/report.html

The log is here:
https://logs.opendaylight.org/releng/jenkins092/netvirt-csit-1node-openstack-newton-nodl-v2-gate-stateful-carbon/196//archives/