Audit fails in VTN Manager when there is no configuration

Issue Scenario:

When there is no configurations in VTN Manager, VTN Coordinator audit fails.

Reproduce the issue:

i) Start VTN Coordinator using the following command "/usr/local/vtn/bin/vtn_start".
ii) Create controller in VTN Coordinator with audit disabled.
iii) Update the controller to enable audit in VTN Coordinator.
iv) After updating controller in VTN Coordinator, audit fails in VTN Manager.