segstore: use eclipse Performance for SegmentStore perf test

segstore: use eclipse Performance for SegmentStore perf test

Before this patch, the segment store performance would only
print the benchmark results in the stdout after one run.
This patch uses the eclipse Performance plugin to run the
tests 10 times and provide more detailed output.

Change-Id: I98738c52f5c7f1bb81f152b38b97595056d8e60c
Signed-off-by: Loïc Prieur-Drevon <loic.prieurdrevon@gmail.com>
Reviewed-on: https://git.eclipse.org/r/84496
Reviewed-by: Hudson CI
Reviewed-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Tested-by: Genevieve Bastien <gbastien+lttng@versatic.net>
Reviewed-by: Matthew Khouzam <matthew.khouzam@ericsson.com>