This fixes the `docker events`-related tests as they have been
failing due to clock skew between CI machine and test daemon on
some other machine (even 1-2 seconds of diff causes races as
we pass local time to --since/--until).
If we're running in same host, we keep using time.Now(), otherwise
we read the system time of the daemon from `/info` endpoint.
Fixes pretty much all events-related tests on windows CI.
Signed-off-by: Ahmet Alp Balkan <ahmetalpbalkan@gmail.com>