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Here's maybe a hack you could try.

1. Deploy an instance from whatever image you want. 
2.Shutdown instance. 
3.Goto vCenter in web client right click powered off vm that was created on your OpenStack cluster.
4. Select vCenter Actions then Compatibility and Upgrade VM to latest hardware (if greyed it should be on the latest your host supports)  ESXi 5.0 = version 8 ESXi 5.1 = version 9 ESXi 5.5 = version 10
5. Right click VM again and edit settings
6. Under virtual hardware select CPU and tick the "hardware virtualization box"
7. Click ok
8. Boot VM from an ISO of ESXi and install over whatever your image had.
9. I suggest probably rebooting your compute node after this.
10. Power off VM after installation and configuration completes
11. Attempt to power on instance from OpenStack.

Warning this may have a good chance of not working....but might be worth the try.

Here's maybe a hack you could try.

1. Deploy an instance from whatever image you want. 
2.Shutdown instance. 
3.Goto vCenter in web client right click powered off vm that was created on your OpenStack cluster.
4. Select vCenter Actions then Compatibility and Upgrade VM to latest hardware (if greyed it should be on the latest your host supports)  ESXi 5.0 = version 8 ESXi 5.1 = version 9 ESXi 5.5 = version 10
5. Right click VM again and edit settings
6. Under virtual hardware select CPU and tick the "hardware virtualization box"
7. Click ok
8. Boot VM from an ISO of ESXi and install over whatever your image had.
9. I suggest probably rebooting your compute node after this.
10. Power off VM after installation and configuration completes
11. Attempt to power on instance from OpenStack.

Warning this may have a good chance of not working....but might be worth the try.

Edit:

There are so many flaws in my plan I would be surprised if it worked. Furthermore if it worked it would be nice to port your VM into glance for a quick redeploy when needed.

Something to think about is this: http://www.virtuallyghetto.com/2013/12/how-to-properly-clone-nested-esxi-vm.html