Fix vrouter-agent crash while parsing SLO config
Fix vrouter-agent crash while parsing SLO config

Change-Id: Iab26a787494b3b42bab4c9743fb800caa38a0c80
Closes-Bug: #1753922

rombie/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,rombie/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,eonpatapon/contrail-controller,rombie/contrail-controller