Currently the build-conf is managed outside of the setup transaction, if upgrade from 3.3 fails, we leave it. Then next attempt assumes that 3.4 is available. We should backup this directory before process and restore if setup fails, to avoid these cases.
This is an automated message oVirt 3.4.1 has been released: * should fix your issue * should be available at your local mirror within two days. If problems still persist, please make note of it in this bug report.