Merge "Bug 873: Robot Automation Improvement 1. Create a separate test to...

Merge "Bug 873: Robot Automation Improvement 1. Create a separate test to delete NS instance, extracted from NS launch test 2. Include test suite to test network slicing using NST 3. Include Platform Recovery & Resiliency Test 4. Include RBAC for platform test which require to update nbi docker service that is govern by stage-3 pipeline jobs under robot test"