Jobs.hs: move OpStatus and JobStatus ADTs to Types.hs

This leaves Ganeti/Jobs.hs and Test/Ganeti/Jobs.hs empty, but they're the
target of a future move of some functions, so we leave them around, and
don't delete them, to avoid unnecessary delete/create diffs.

Signed-off-by: Dato Simó <dato@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>