Merge branch 'js/test-whitespace-fixes'

Test code clean-up.

* js/test-whitespace-fixes:
  t9603: use tabs for indentation
  t5570: remove trailing padding
  t5400,t5402: consistently indent with tabs, not with spaces
  t3427: adjust stale comment
  t3406: indent with tabs, not spaces
  t1004: insert missing "branch" in a message