Otherwise ara had only the stderr part and logs only the
stdout part which made ordered analysis harder.

Additionally add -vvv for the bootstrap-servers run.

Change-Id: Ia42ac9b90a17245e9df277c40bda24308ebcd11d
Signed-off-by: Radosław Piliszek <radoslaw.piliszek@gmail.com>

This change is intended to ease the addition of new test scenarios, by
splitting the existing setup_gate.sh script up into several smaller
scripts. We may wish to further break these scripts up in future,
depending on the requirements of new test jobs.

Change-Id: Ifa442ac79a54f749c56d20f5f7383c3852d95268