tempest: Fix exception handling

In autoscaling scenarion we show the metric catalog name instead
of the asked one.

This change fixes that.

Change-Id: I62771e79662463d6c54b806bd12a74a26a898243
1 file changed
tree: 06829c66ca8b9706522a05b8d46f34ddce67e525
  1. ceilometer/