Move setupReflog test function to only test that cares

Only one test class actually needs this function, so instead of
us inheriting it down into every test, move it to that one class.

Change-Id: I5700ca48df4177153f2b3861dec7c538c621e775
Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2 files changed