Core changes for config test cases
Core changes for config test cases

Partial-bug: #1520442

Change-Id: I93485ff6cc975162a17d36b4fe13762f0ea5a6d0

biswajit-mandal/contrail-web-core,nagakiran/contrail-web-core,vishnuvv/contrail-web-core,nagakiran/contrail-web-core,vishnuvv/contrail-web-core,nagakiran/contrail-web-core,biswajit-mandal/contrail-web-core,vishnuvv/contrail-web-core,biswajit-mandal/contrail-web-core