[Bug 1244464] [NEW] cinder backup should use pipe for diff transfer

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When the cinder ceph backup driver attempts a differential transfer, the
diff is held in memory. This will rapidly become a problem e.g. for
bootable volumes, resulting in memory allocation errors.

** Affects: cinder
     Importance: Critical
     Assignee: Edward Hope-Morley (hopem)
         Status: Fix Released

** Affects: cinder/havana
     Importance: Critical
     Assignee: Edward Hope-Morley (hopem)
         Status: Fix Released

** Affects: cinder (Ubuntu)
     Importance: Undecided
         Status: New

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cinder backup should use pipe for diff transfer
https://bugs.launchpad.net/bugs/1244464
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