Set different NTP server

[lunanigra]

Hi, first thanks for your cool Azure lib incl. a fully documented example.

Per default pool.ntp.org is used as NTP server. In our company we cannot use external NTP servers. How to define another NTP server without the need of modifying your code?

[andriyadi]

@lunanigra I may make it configurable. Stay tune :)

[lunanigra]

Thanks, would be cool! An approach how to do it temporary would be appreciated as well...