drop smartmontools dependency

it is a soft requirement and pulled in by nethserver-smartd. 
nethetserver-smartd is already required in the iso-compsgroup thus impact is minor.

Author: markVnl

nethserver-base.spec

@@ -7,7 +7,6 @@ Source: %{name}-%{version}.tar.gz
 BuildArch: noarch
 URL: %{url_prefix}/%{name}
 
-Requires: smartmontools
 Requires: bridge-utils
 Requires: sudo
 Requires: nc