Merge branch 'js/rebase-i-redo-exec'

"git rebase -i" learned to re-execute a command given with 'exec' to run after it failed the last time. * js/rebase-i-redo-exec: rebase: introduce a shortcut for --reschedule-failed-exec rebase: add a config option to default to --reschedule-failed-exec rebase: introduce --reschedule-failed-exec