Update reflog tests to reflect libgit2 changes.
Update reflog tests to reflect libgit2 changes.

Creating a reference now automatically creates an initial reflog entry.

libgit2/rugged,saraid/rugged,Acidburn0zzz/rugged,libgit2/rugged,Acidburn0zzz/rugged,saraid/rugged,tpickett66/rugged,libgit2/rugged,tpickett66/rugged,saraid/rugged,Acidburn0zzz/rugged,tpickett66/rugged