[Bug 1369465] [NEW] nova resize doesn't resize(extend) rbd disk files when using rbd disk backend

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[Impact]

 * Not able to resize rbd backed disk image.

[Test Case]

1 - boot an instance with rbd backed disk image
2 - resize it
3 - log into the VM
4 - the disk is not enlarged without this patch

[Regression Potential]

 * None


tested with nova trunk commit eb860c2f219b79e4f4c5984415ee433145197570

Configured Nova to use rbd disk backend

nova.conf

[libvirt]
images_type=rbd

instances booted successfully and instance disks are in rbd pools, when
perform a nova resize  to an existing instance,  memory and CPU changed
to be new flavors but instance disks size doesn't change

** Affects: nova
     Importance: Medium
     Assignee: Nicolas Simonds (nicolas.simonds)
         Status: Fix Released

** Affects: nova/liberty
     Importance: Medium
     Assignee: Tony Breeds (o-tony)
         Status: Fix Committed

** Affects: nova (Ubuntu)
     Importance: Undecided
     Assignee: Liang Chen (cbjchen)
         Status: Confirmed


** Tags: ceph cts in-stable-liberty patch sts sts-sru volumes
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nova resize doesn't resize(extend) rbd disk files when using rbd disk backend
https://bugs.launchpad.net/bugs/1369465
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