Merge branch 'dl/rebase-with-autobase'

"git rebase" did not work well when format.useAutoBase
configuration variable is set, which has been corrected.

* dl/rebase-with-autobase:
  rebase: fix format.useAutoBase breakage
  format-patch: teach --no-base
  t4014: use test_config()
  format-patch: fix indentation
  t3400: demonstrate failure with format.useAutoBase

diff --cc builtin/log.c
Simple merge

diff --cc builtin/rebase.c
Simple merge

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