add mongodb_3_4 to testing.conf.example
add mongodb_3_4 to testing.conf.example

jedesah/Quasar,quasar-analytics/quasar,slamdata/slamengine,slamdata/slamengine,quasar-analytics/quasar,slamdata/quasar,slamdata/slamengine,jedesah/Quasar,jedesah/Quasar,djspiewak/quasar,quasar-analytics/quasar,jedesah/Quasar,quasar-analytics/quasar