Feature 10981: remove mon and pol for ng-sa installation

This change removes the deployment of POL for NG-SA installation.
In addition, it deploys a reduced MON, which will only run
mon-dashboarder. A new K8s manifest (ng-mon.yaml )file has been created
for the purpose.

Change-Id: I243a2710d7b883d505ff4b4d012f7d67920f0e73
Signed-off-by: garciadeblas <gerardo.garciadeblas@telefonica.com>