Add query for heat assert isinstance bug 1326946

This bug displays a pattern of failures, I selected one of the
failures for the fingerprint. This bug is the result of a merge
conflict, the patch to fix the bug is in the pipelines. This
filters on the gate queue only.

Change-Id: Ifd3b93753a9892eb97b51027765b8a874afee8d9
Merge "Add query for heat assert isinstance bug 1326946"