package/nut: new package

'nut' are the Network UPS Tools.

[Note: original patch from Dallas, but completely revamped
 by Yann, so nothing remains from the original patch, but two
 variable names.]

Signed-off-by: Dallas Clement <dallas.a.clement@gmail.com>
[yann.morin.1998@free.fr: refresh patch, use latest version,
    add license, fix commit message, add dependencies, fix
    runtime path, fix libs-config, move to 'system utils']
Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>