fix typo in nologin parametre

in sample config file, nologin parametre is "nologinfile"
however, in libnetmagis.tcl , it's spelled "nologin".

Since we can't change nstalled config files all around the world,
it's better to change libnetmagis.tcl.
Merge pull request #134 from schplurtz/nologin

fix typo in nologin parametre

Thanks to Schplurtz