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