Document all options

[dargor]

# gridinit -h

Usage: gridinit [OPTIONS] ... CONFIG_PATH [LOG4C_PATH]
 with OPTIONS:
    -d       : Detaches then daemonizes the gridinit
    -h       : displays this help section
    -g GROUP : limits the services loading to those belonging to
               the specified group. This option can be repeated.
    -q       : quiet mode, suppress non-error output

But the init script use an undocumented option -s : ExecStart=/usr/bin/gridinit -s GRIDINIT,local,gridinit,0 /etc/gridinit.conf, please document it (and any missing option).