Revert "add query for trove failure in devstack exercises"

This reverts commit 8f9e51eecee96253d77b61274664609f11cd0a06.

There are thousands of hits for this but they are 99% successful
runs and the other 1% is unstable runs.

Change-Id: I80ab25ca31f2be0a5e69d7a8f492e9f9e0f2edbb
Merge "Revert "add query for trove failure in devstack exercises""