lua-factory: Split out GrlNetWc option setting
lua-factory: Split out GrlNetWc option setting

We'll need this shortly.

https://bugzilla.gnome.org/show_bug.cgi?id=728525

jasuarez/grilo-plugins,vrutkovs/grilo-plugins,MathieuDuponchelle/grilo-plugins,MikePetullo/grilo-plugins,vrutkovs/grilo-plugins,GNOME/grilo-plugins,jasuarez/grilo-plugins,MikePetullo/grilo-plugins,MathieuDuponchelle/grilo-plugins,MathieuDuponchelle/grilo-plugins,MikePetullo/grilo-plugins,grilofw/grilo-plugins,MathieuDuponchelle/grilo-plugins,vrutkovs/grilo-plugins,GNOME/grilo-plugins,grilofw/grilo-plugins,vrutkovs/grilo-plugins