pbft/test: use time.Sleep() instead of ticker
pbft/test: use time.Sleep() instead of ticker

On my system the ticker will make the test fail, while using a plain
time.Sleep() makes it work.  This may be caused by the ticker writing to
the channel while intermediate operations are happening, thereby
shorting the total time spent sleeping.

Signed-off-by: Simon Schubert <51a3d642c59e957126c8c9975e756dadd0226d4c@zurich.ibm.com>

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