This commit add automated test case to verify subcloud addition process The test performs the following steps: * add subcloud1 * manage subcloud1 * validate the subcloud is added, managed and online ** will move all dc sanity test case to this file Change-Id: Id39ed755c860a4a7ae2579a380a574fab723bccf Signed-off-by: Abhishek jaiswal <abhishek.jaiswal@windriver.com>