[issue13327] Update utime API to not require explicit None argument

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

> The `delta` keyword would actually be better than `places`, especially
> on the slower buildbots. delta=10 would allow up to 10 seconds between
> those utime calls. Is that being too permissive?

I think it's ok. We don't have to test the system's utime
implementation, just that the second parameter does what it should.

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