Issue #21918: Convert test_tools.py to a sub-package of test.

Merge with 3.4.

diff --cc Misc/NEWS
index e0ebf673416325290ef4d0f8d3de935799e9ff44,d5715789f46ef9bdf6f32550eb64d7041ea6e6a5..83c629f2dec0b99c91ae6c8892b0653588ad0a2a
--- 1/Misc/NEWS
--- 2/Misc/NEWS
+++ b/Misc/NEWS
@@@ -698,37 -565,6 +698,40 @@@ Documentatio
  Tests
  -----
  
++- Issue #21918: Converted test_tools from a module to a package containing
++  separate test files for each tested script.
++
 +- Issue #9554: Use modern unittest features in test_argparse. Initial patch by
 +  Denver Coneybeare and Radu Voicilas.
 +
 +- Issue #20155: Changed HTTP method names in failing tests in test_httpservers
 +  so that packet filtering software (specifically Windows Base Filtering Engine)
 +  does not interfere with the transaction semantics expected by the tests.
 +
 +- Issue #19493: Refactored the ctypes test package to skip tests explicitly
 +  rather than silently.
 +
 +- Issue #18492: All resources are now allowed when tests are not run by
 +  regrtest.py.
 +
 +- Issue #21634: Fix pystone micro-benchmark: use floor division instead of true
 +  division to benchmark integers instead of floating point numbers. Set pystone
 +  version to 1.2. Patch written by Lennart Regebro.
 +
 +- Issue #21605: Added tests for Tkinter images.
 +
 +- Issue #21493: Added test for ntpath.expanduser().  Original patch by
 +  Claudiu Popa.
 +
 +- Issue #19925: Added tests for the spwd module. Original patch by Vajrasky Kok.
 +
 +- Issue #21522: Added Tkinter tests for Listbox.itemconfigure(),
 +  PanedWindow.paneconfigure(), and Menu.entryconfigure().
 +
 +- Issue #17756: Fix test_code test when run from the installed location.
 +
 +- Issue #17752: Fix distutils tests when run from the installed location.
 +
  - Issue #18604: Consolidated checks for GUI availability.  All platforms now
    at least check whether Tk can be instantiated when the GUI resource is
    requested.