Add check on installation of helm-charts in install_ngsa.sh

Increased timeout for deploying Airflow helm-chart.

Change-Id: Ib2d9c1802739dc2288ed9b827e23ea6f7c22d07c
Signed-off-by: aguilard <e.dah.tid@telefonica.com>
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>