• commit 475b131 was needed to extract the correct major version
  it was reworked to use pg_lsclusters to detect server version
  instead psql tool version.
• if installed postgresql is lower than major 10 the tests is
  marked as skipped.
• the pg_*cluster commands need to be run as root user.
  the systemtest will now check that condition and mark the test
  as skipped if not.
• move redondant code for PG_VERSION to setup_local_db.sh
• move redondant check PG_VERSION > 10 to setup_local_db.sh
• add --no-psqlrc flag to PGSQL command

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