Comment 4 for bug 630593

> 3.) with this change we should remove the '--no-datahub' switch of the daemon and replace it by '--use-datahub </path/to/datahub>'

I think this is not necessary, the vala port uses the same binary name and is installed in /usr/bin, so it'll work exactly the same, moreover I don't think anyone is going to put effort to properly split out the python datahub to have it available as a standalone app (so one could choose which datahub to use).