Log Message:
py-test: updated to 4.2.0

pytest 4.2.0:

Features
* Class xunit-style functions and methods now obey the scope of autouse fixtures.
This fixes a number of surprising issues like setup_method being called before \ 
session-scoped autouse fixtures.

* Display a message at the end of the test session when running under Python 2.7 \ 
and 3.4 that pytest 5.0 will no longer support those Python versions.
* The number of selected tests now are also displayed when the -k or -m flags \ 
are used.
* pytest_report_teststatus hook now can also receive a config parameter.
* pytest_terminal_summary hook now can also receive a config parameter.

Bug Fixes
* --junitxml can emit XML compatible with Jenkins xUnit. junit_family INI option \ 
accepts legacy|xunit1, which produces old style output, and xunit2 that conforms \ 
more strictly to \ 
https://github.com/jenkinsci/xunit-plugin/blob/xunit-2.3.2/src/main/resources/org/jenkinsci/plugins/xunit/types/model/xsd/junit-10.xsd
* Improve quitting from pdb, especially with --trace.
Using q[quit] after pdb.set_trace() will quit pytest also.

* Warning summary now groups warnings by message instead of by test id.
This makes the output more compact and better conveys the general idea of how \ 
much code is actually generating warnings, instead of how many tests call that \ 
code.

* monkeypatch.delattr handles class descriptors like staticmethod/classmethod.
* Restore marks being considered keywords for keyword expressions.
* tmp_path fixture and other related ones provides resolved path (a.k.a real path)
* pytest_terminal_summary uses result from pytest_report_teststatus hook, rather \ 
than hardcoded strings.
* Correctly handle unittest.SkipTest exception containing non-ascii characters \ 
on Python 2.
* Ensure the tmpdir and the tmp_path fixtures are the same folder.
* Ensure tmp_path is always a real path.

Trivial/Internal Changes
* Use a.item() instead of the deprecated np.asscalar(a) in pytest.approx.
np.asscalar has been deprecated in numpy 1.16..

* Copy saferepr from pylib