Remove desired instances and desired memory from audit events.

Use App usage events if you want to get the desired footprints.

[finished #62496262]

Signed-off-by: Joseph Palermo <jpalermo@pivotallabs.com>
Using truncate is non-transactional so the test can't be.

Signed-off-by: Joseph Palermo <jpalermo@pivotallabs.com>