NTP: define servers with a list instead of few variables
Common: Use with_items for copy a few files

NTP: fix vars check
Common: fix ntp template

Change timezone in /etc/timezone instead of debconf.

Moving the host_vars directory in root directory in order to respect http://docs.ansible.com/playbooks_best_practices.html#directory-layout
Merge pull request #1 from nanowish/master

A few changes for common by nanowish