Adding a ntp_client module.

This module is responsible for installing ntp and syncing a client based
ntp.conf file.
Currently, the default CentOS ntp.conf file is fine for the server.
Adding a ntp_server module that just installs ntp.

This is here to allow ntp_client to sync the ntp package and conf file
intallation.
I may add a server specific conf file if I feel bold, but I don'
t see a need at the moment.