Merge branch 'nd/combined-test-helper'

Small test-helper programs have been consolidated into a single
binary.

* nd/combined-test-helper: (36 commits)
  t/helper: merge test-write-cache into test-tool
  t/helper: merge test-wildmatch into test-tool
  t/helper: merge test-urlmatch-normalization into test-tool
  t/helper: merge test-subprocess into test-tool
  t/helper: merge test-submodule-config into test-tool
  t/helper: merge test-string-list into test-tool
  t/helper: merge test-strcmp-offset into test-tool
  t/helper: merge test-sigchain into test-tool
  t/helper: merge test-sha1-array into test-tool
  t/helper: merge test-scrap-cache-tree into test-tool
  t/helper: merge test-run-command into test-tool
  t/helper: merge test-revision-walking into test-tool
  t/helper: merge test-regex into test-tool
  t/helper: merge test-ref-store into test-tool
  t/helper: merge test-read-cache into test-tool
  t/helper: merge test-prio-queue into test-tool
  t/helper: merge test-path-utils into test-tool
  t/helper: merge test-online-cpus into test-tool
  t/helper: merge test-mktemp into test-tool
  t/helper: merge (unused) test-mergesort into test-tool
  ...

t/t3404-rebase-interactive.sh

@@ -711,13 +711,13 @@ test_expect_success 'rebase -i continue with unstaged submodule' '
 test_expect_success 'avoid unnecessary reset' '
 	git checkout master &&
 	git reset --hard &&
-	test-chmtime =123456789 file3 &&
+	test-tool chmtime =123456789 file3 &&
 	git update-index --refresh &&
 	HEAD=$(git rev-parse HEAD) &&
 	set_fake_editor &&
 	git rebase -i HEAD~4 &&
 	test $HEAD = $(git rev-parse HEAD) &&
-	MTIME=$(test-chmtime -v +0 file3 | sed 's/[^0-9].*$//') &&
+	MTIME=$(test-tool chmtime -v +0 file3 | sed 's/[^0-9].*$//') &&
 	test 123456789 = $MTIME
 '