[PATCH xts] Don't sleep(2) at the beginning of Xt test setup

[Eric Anholt]

Adam Jackson <ajax at redhat.com> writes:

> Regeneration is fast enough these days, we can skip this. This
> eliminates about 40 minutes of wall time from a full xts run.

If not sleeping is a problem, we should figure out a way to make
regeneration not racy.  Sleeps aren't OK.

Reviewed-by: Eric Anholt <eric at anholt.net>
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