Merge branch 'dl/apply-3way-diff3'

"git apply --3way" learned to honor merge.conflictStyle configuration variable, like merges would. * dl/apply-3way-diff3: apply: respect merge.conflictStyle in --3way t4108: demonstrate bug in apply t4108: use `test_config` instead of `git config` t4108: remove git command upstream of pipe t4108: replace create_file with test_write_lines