#1404 test backup functionality on google cloud and other s3 interop providers.

  • create vol s3-testand mount to a node on /mnt/s3-test via pvc
  • write some data on vol s3-test
  • take backup(1)
  • write new data on vol s3-test
  • take backup(2)
  • restore backup(1)
  • verify data is consistent with backup(1)
  • restore backup(2)
  • verify data is consistent with backup(2)
  • delete backup(1)
  • delete backup(2)
  • delete backup volume s3-test
  • verify volume path is removed
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