am 4a64bded: Add some helpful tests scripts for backup and make bmgr restore wait until the backup is done.

Merge commit '4a64bded06a0299785c295a975e2818308eb53e2'

* commit '4a64bded06a0299785c295a975e2818308eb53e2':
  Add some helpful tests scripts for backup and make bmgr restore wait until the backup is done.