The subquery assertion support has changed during development of the

upcoming version of Djblets, and many of our recent datagrid and webapi

unit tests were written with the old approach. Many of them also had

extra queries expected that weren't actually executed, but due to a bug

in the prior implementation, they would not be listed if the executed

queries otherwise matched.
These queries have been reworked to use the new subquery matching, to

define a __note__ for debugging, and to remove the excess query

expectations.

All unit tests pass.