"service" is a simple wrapper that will allow to call init.d scripts

current method:     #  /etc/init.d/network reload
with the wrapper:   #  service network reload

If the wrapper is called without arguments or with a wrong init script name, it will print an error and list the content of /etc/init.d/ folder

Signed-off-by: Alberto Bursi <alberto.bursi@outlook.it>