Backup and restore scenario

This testcase verifies content preservation after backup and restore
operations by booting a server from a restored backup and check the
connectivity to it, this will indicate that the image data was preserved.

Added:
- 'create_backup' method in scenario/manager
- 'restore_backup' method in scenario/manager

Change-Id: I20ebf2bb2e4950c24d912c24a081dc0ac0101b8d
3 files changed