[fix] Add actual error message from OS to log

The openstack client libraries bury the actual error message reported by
the openstack servers inside a Requests.Response object. This patch
makes sure we retrieve this message, as it is more useful than the top
level one.

chi-lease.py

@@ -63,7 +63,8 @@ def do_create(argv):
         resp = client.lease.create(**args)
         print(json.dumps(resp, indent=4))
     except keystoneauth1.exceptions.http.InternalServerError as e:
-        print(e.message)
+        error_message = json.loads(e.response.text)['error_message']
+        print("error:", error_message)
 
 
 def do_delete(argv):