conf: Change virStoragePoolSaveConfig prototype s/configDir/configFile
conf: Change virStoragePoolSaveConfig prototype s/configDir/configFile

Just a minor change which might be a little confusing for someone
looking only at the API.

crobinso/libvirt,andreabolognani/libvirt,VenkatDatta/libvirt,jardasgit/libvirt,rlaager/libvirt,fabianfreyer/libvirt,jardasgit/libvirt,agx/libvirt,datto/libvirt,eskultety/libvirt,agx/libvirt,andreabolognani/libvirt,libvirt/libvirt,nertpinx/libvirt,nertpinx/libvirt,olafhering/libvirt,taget/libvirt,datto/libvirt,agx/libvirt,VenkatDatta/libvirt,olafhering/libvirt,agx/libvirt,olafhering/libvirt,zippy2/libvirt,rlaager/libvirt,andreabolognani/libvirt,rlaager/libvirt,jfehlig/libvirt,libvirt/libvirt,VenkatDatta/libvirt,datto/libvirt,jfehlig/libvirt,nertpinx/libvirt,VenkatDatta/libvirt,eskultety/libvirt,fabianfreyer/libvirt,zippy2/libvirt,taget/libvirt,datto/libvirt,zippy2/libvirt,eskultety/libvirt,andreabolognani/libvirt,zippy2/libvirt,taget/libvirt,nertpinx/libvirt,fabianfreyer/libvirt,libvirt/libvirt,taget/libvirt,jfehlig/libvirt,rlaager/libvirt,rlaager/libvirt,libvirt/libvirt,eskultety/libvirt,VenkatDatta/libvirt,crobinso/libvirt,jardasgit/libvirt,fabianfreyer/libvirt,andreabolognani/libvirt,taget/libvirt,fabianfreyer/libvirt,agx/libvirt,nertpinx/libvirt,jfehlig/libvirt,jardasgit/libvirt,eskultety/libvirt,jardasgit/libvirt,olafhering/libvirt,crobinso/libvirt,crobinso/libvirt,datto/libvirt