partition not resizing in Folsom

How are you resizing the image?

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We are unable to resize the disk of centos images on our grizzly cloud.

I am seeing this with a 3 controller HA running ubuntu 12.04 and centos 6.5 compute nodes.
We are running grizzly,

We have tried 4 different centos images online including http://download.cirros-cloud.net/0.3.1/cirros-0.3.1-x86_64-disk.img from the official documentation.
Many centos images that avertise themselves as openstack ready do not actually bundle growroot and growpart with cloud-init, such as http://mirror.catn.com/pub/catn/images/qcow2/centos6.4-x86_64-gold-master.img, however, the cirros image does.

To reproduce
1. Upload any centos image to grizzly openstack
2. Select a non-zero hardisk for flavor
3. Boot the instance
4. Check the disk with df and fdisk -l and note the mounted disk has the correct size, but the partition is the size of root partition on the centos image not of that requested by the flavor. I have not found a workaround to resize post-boot and I have read that this must be done on first boot.

DETAILS:
Note that following the same steps above for ubuntu images works as expected.

glance image-create --name cirros-0.3.1-x86_64-disk.img --disk-format=qcow2 --container-format=bare --is-public=True < cirros-0.3.1-x86_64-disk.img
+------------------+--------------------------------------+
| Property | Value |
+------------------+--------------------------------------+
| checksum | d972013792949d0d3ba628fbe8685bce |
| container_format | bare |
| created_at | 2014-03-16T15:51:12 |
| deleted | False |
| deleted_at | None |
| disk_format | qcow2 |
| id | d115216f-8dd7-4d18-b82f-6f13831bfe7b |
| is_public | True |
| min_disk | 0 |
| min_ram | 0 |
| name | cirros-0.3.1-x86_64-disk.img |
| owner | 8816b12314484ed88829cf2041f2ff1a |
| protected | False |
| size | 13147648 |
| status | active |
| updated_at | 2014-03-16T15:51:13 |
+------------------+--------------------------------------+

root@node-8:~# nova flavor-list
+--------------------------------------+--------------+-----------+------+-----------+------+-------+-------------+-----------+-------------+
| ID | Name | Memory_MB | Disk | Ephemeral | Swap | VCPUs | RXTX_Factor | Is_Public | extra_specs |
+--------------------------------------+--------------+-----------+------+-----------+------+-------+-------------+-----------+-------------+
| 7d0c634a-2368-49b5-9efd-0527f69b6973 | 4c_4m_20d | 4096 | 20 | 0 | | 4 | 1.0 | True | {} |

+--------------------------------------+--------------+-----------+------+-----------+------+-------+-------------+-----------+-------------+

$ d...