Merge branch 'mz/rebase-tests'

* mz/rebase-tests:
  rebase topology tests: fix commit names on case-insensitive file systems
  tests: move test for rebase messages from t3400 to t3406
  t3406: modernize style
  add tests for rebasing merged history
  add tests for rebasing root
  add tests for rebasing of empty commits
  add tests for rebasing with patch-equivalence present
  add simple tests of consistency across rebase types

diff --cc t/t3400-rebase.sh
Simple merge

diff --cc t/t3404-rebase-interactive.sh
Simple merge