Commits on Jul 16, 2019

1. UPSTREAM: 312: Retry provisioning of volumes after transient error …

   The provisioner should retry CreateVolume call after a transient error
   (such as timeout), because the CSI driver may be creating a volume in the
   background.
   
   Therefore ProvisionerExt interface need to be implemented. ProvisionExt()
   returns:
   
   - Finished, if it can be 100% sure that the driver is not creating a volume
   - NoChange, if something (temporarily?) failed before reaching the CSI
     driver, for example when Kubernetes API server is not reachable.
   - InBackground, if error returned by the driver (or gRPC) is transient.

   

   jsafrane committed Jul 16, 2019
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