Add query for nova unit test jsonschema race

This is a race in the nova unit tests using
jsonschema validation which had a new release
2.4.0 on 8/19.

There are 32 hits in 48 hours, check queue only
but multiple changes, all failures.

Change-Id: Id40cf09bd41cca04fc931cdea0ac515d24b8ee23
Related-Bug: #1358881