Edmund Rhudy b85d2812a8 Adds allow_availability_zone_fallback option to Cinder
This change adds allow_availability_zone_fallback, which allows Cinder
to fall back to an already configured availability zone if the
requested availability zone is unavailable.

Change-Id: Id6b43fc3243b4de82241cfab34ff10953b537874
DocImpact: cinder
Closes-Bug: #1489575
2015-09-03 11:13:02 -04:00
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