Comment 2 for bug 1352193

from following result

jichen@cloudcontroller:~$ glance image-update --property Key1=Value2 --purge-props 64f067bd-ce03-4f04-a354-7188a4828e8e
+------------------+--------------------------------------+
| Property | Value |
+------------------+--------------------------------------+
| Property 'key1' | Value2 |

I think we need to confirm with glance whether they only accept lower case key/value pair
if that's the case, nova should be updated in order to fit for that restriction