Merge branch 'hn/reflog-tests'

Prepare tests on ref API to help testing reftable backends.

* hn/reflog-tests:
  refs/debug: trim trailing LF from reflog message
  test-ref-store: tweaks to for-each-reflog-ent format
  t1405: check for_each_reflog_ent_reverse() more thoroughly
  test-ref-store: don't add newline to reflog message
  show-branch: show reflog message

diff --cc refs/debug.c
Simple merge

diff --cc t/helper/test-ref-store.c
Simple merge

diff --cc t/t1405-main-ref-store.sh
Simple merge

diff --cc t/t1406-submodule-ref-store.sh
Simple merge