Cleanup revocation query

The code in the revoke sql backend to calculate the query for the
list of events was creating a temporary and then discarding it,
and blaming not using it on sqlite.

Rather than discard the temporary, a reference is kept to it so
that it can be used.

Change-Id: Ifdb6a70900af85869b43d319eab8aa2a6b2bc162
Remove unnecessary test setUps

There is no reason to have a setUp case if all we do is chain to the
parent.

Change-Id: Id31281a9d50588f036e03b458ccfb71d1010f2d6
Merge "Cleanup revocation query"
Merge "Remove unnecessary test setUps"