Create a FakeArchive class to forge test results

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Clarify job vs. run

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>
Add test for test_all_runs

Signed-off-by: Zack Cerza <zack.cerza@inktank.com>