Big concurrency patch

Signed-off-by: Stéphane Depierrepont <toorop@toorop.fr>
Big todo patch

Signed-off-by: Stéphane Depierrepont <toorop@toorop.fr>
Large dns patch

Signed-off-by: Stéphane Depierrepont <toorop@toorop.fr>