store: do not record file that are not part of a revlog in fncache The fncache exist to list file to copy/stream when cloning a repository, it should only contains file that are relevant for a revlog in such case. For example, temporary file are not relevant. So we now skip the addiction of non-relevant file to the fn-cache in the first place.

revlog-split: expand the some test to cover the success case too It seems useful to double check the case of a transaction successfully committed before trying the one with transaction abort.