remove failures when we request the failure to run and it doesn't

[Robert Collins]

If testr explicit requests a test case X to run, and it doesn't, and the
stream generator does not error, then X has been deleted and the failure
info for it has become obsolete.

 affects testrepository
 status triaged
 importance wishlist
 done

[Robert Collins (lifeless)]

On Thu, 2010-03-04 at 23:28 +0000, Robert Collins wrote:
> Public bug reported:
>
> If testr explicit requests a test case X to run, and it doesn't, and the
> stream generator does not error, then X has been deleted and the failure
> info for it has become obsolete.

This may need more smarts than this - gtester stops running tests when
the first failure occurs, and other things may do that to. Perhaps a
config switch.

-Rob

[Robert Collins (lifeless)]

Trunk does most of this - when a full run happens, missing tests are removed. However on partial runs it does not cross reference the requested test id with the seen ones.