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You will need to provide us with more information to properly diagnose the problem. Start by showing us exactly the command you use to upload the image to OpenStack. Do not type this information, copy and paste the exact command that you use. Show us the output of the command as well. When uploading the image, make sure that you correctly specify the image format:

glance image-create --disk-format qcow2 --container-format bare --is-public True \
  --name cirros --copy-from

Now, show us the exact command you use to boot an instance from that image.

Look in /var/log/nova/compute.log on the compute host. Are there any error messages in the log that were logged in response to booting the image? Show us those errors (not the whole log file).

There are many people successfully using qcow2 images with OpenStack, both with Havana and with earlier versions. With appropriate diagnostic information from your environment we can probably figure out what's going on.