[6.5.1.a] Introduce 'NONE' driver

[MRatWork]

Since 6.5.1.a-2013100403, Web, DNS and Spam have 'none' option in 'Switch Programs'.

So, what's the meaning and purpose of 'none' driver?.

Imagine, we don't need dns server on our server (because handle by other server) and with this condition we can select 'none' in 'dns' and then Kloxo-MR will be uninstall dns packages and no process for config again.

[Spacedust]

Very good idea Should be for FTP too.

[MRatWork]

FTP (also mail) not 'real' object in panel term. So, it's hard to add 'none' driver.

[Spacedust]

What about MySQL ? We do not need it on some servers and it takes a lot of memory.