Added test case for immediate migration#968

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Click2cloud-Wadhai wants to merge 5 commits intosodafoundation:developmentfrom

Click2Cloud:test_immediate_migration

Commits on May 19, 2020

Added junit test framework with gradle build.
Click2cloud-Wadhai
committed

Commits on May 20, 2020

Added test case for negative scenarios for bucket and backend.
Click2cloud-Pathak
committed

Commits on May 22, 2020

Added test case for verifying backend list and failed backend and bucket scenarios.
Click2Cloud-Faizan
committed
Added test case for delete bucket and backend with failed scenarios. Also used common code for get bucket name.
click2cloud-rajat
committed

Commits on May 25, 2020

Added test case for immediate migration also added base class for common methods.
Click2cloud-Wadhai
committed