[BUG] Gate auto-update with big RTB

[nicolas-rabault]

Describe the bug
When we create a lot of auto-update at the same time all the services reply in a short period of time. But after few seconds we can see that this period of time become larger and larger. The space between boards diverge.

Network configuration

• Any

How to reproduce the bug
Just use a gate with some service with the standard configuration

Additional context
The auto-update feature have a ms granularity. We could reduce this granularity to reduce this divergence.
Most importantly auto-update is computed on luos_loop(). If Luos_loop is executed later after the deadline we create divergence because after send the message we do :
new_trigger_date = current_time + update_time
We should do :
new_trigger_date = last_trigger_date + update_time

[JeromeGalan]

Should be caused by ms granularity.
Test with precise timer (ns granularity)