Update stage3 to get logs even if some containers did not init properly

This commit adds a workaround to get airflow-scheduler log, while Airflow
helm chart is not dealing properly with the value `fullnameOverride`,
which is required now that Airflow is a subchart of OSM Helm chart.

Change-Id: I1db25801a118adc7cd8357ce61039e7761b44ed3
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>