Changed APT step for Ubuntu upgrade.

2.Common_services/2.NTP/0_setup.py

2.Common_services/2.NTP/ntp.conf

...ent_configuration/1.Apply_client_configuration/0_setup.sh

3.New_server_deployment/3.Proxy_settings/0_setup.py

3.New_server_deployment/4.APT_upgrade/0_setup.sh

3.New_server_deployment/4.APT_upgrade/sources16.list

3.New_server_deployment/5.Dell_openmanage/0_setup.sh

global-conf.sh

launcher.sh

tests/test_ntp.py