Close #18929: inspect.classify_class_attrs will now search the metaclasses (last) to find where an attr was defined.

Issue #18937: Add an assertLogs() context manager to unittest.TestCase to ensure that a block of code emits a message using the logging module.

This test will fail because a previous attempt to fix a merge error
in site.py was incorrect, but the test wasn't running so it wasn't
caught.  The next commit will fix the site.py bug.

It now always checks, instead of only when the LICENSE file doesn't exist.  It
is also protected by the 'network' resource, and uses a HEAD request since we
are only doing an existence check.

numeric IP addresses.

Based on report and initial patch from Germán M. Bravo

Patch by Vlad Shcherbina

Patch by Vlad Shcherbina

Patch contributed by Vajrasky Kok. Addresses Issue #17324

Patch contributed by Vajrasky Kok. Addresses Issue #17324

if all necessary functions are already found in libuuid.
Patch by Evgeny Sologubov.

if all necessary functions are already found in libuuid.
Patch by Evgeny Sologubov.

- my previous removal and hg resolve mark had still left them and hooks did not catch it too!