Fixes #6015: Check ntp.conf exists before installing it - port of fix for #6000 to technique version 3.0
Merge pull request #617 from jooooooon/bug_6015/check_ntp_conf_exists_before_installing_it_port_of_fix_for_6000_to_technique_version_3_0

Fixes #6015: Check ntp.conf exists before installing it - port of fix fo...