Do not cache volume status attribute
Do not cache volume status attribute

this field can change by itself even during processing of the stack
(e.g. volume created, and considerably later attached),
or by itself (e.g. going to error).
If something is polling stack or its outputs while the stack is created,
the first value will get cached and returned regardless of actual
volume status.

Change-Id: Ic48a824a330c67cd4d9c4ccff31b6f53f0ca196d
Story: 2007217
Task: 38469

openstack/heat,openstack/heat