Update configuration for version 5 of isort

- remove deprecated configuration options
- remove duplicate isort check via flake8
- fix sort order of imports

modified:   CHANGES.rst
modified:   setup.cfg
modified:   src/Products/SiteErrorLog/SiteErrorLog.py
modified:   src/Products/SiteErrorLog/tests/testInitialization.py
modified:   tox.ini

CHANGES.rst

@@ -4,6 +4,8 @@ Changelog
 5.5 (unreleased)
 ----------------
 
+- Update configuration for version 5 of ``isort``
+
 
 5.4 (2020-02-06)
 ----------------

setup.cfg

@@ -14,8 +14,6 @@ known_third_party = six
 default_section = ZOPE
 line_length = 79
 lines_after_imports = 2
-not_skip =
-    __init__.py
 
 [flake8]
 ignore =

src/Products/SiteErrorLog/SiteErrorLog.py

@@ -28,13 +28,14 @@
 from Acquisition import aq_base
 from App.Dialogs import MessageDialog
 from OFS.SimpleItem import SimpleItem
-from Products.PageTemplates.PageTemplateFile import PageTemplateFile
 from transaction.interfaces import TransientError
 from zExceptions.ExceptionFormatter import format_exception
 from zope.component import adapter
 from zope.event import notify
 from ZPublisher.interfaces import IPubFailure
 
+from Products.PageTemplates.PageTemplateFile import PageTemplateFile
+
 from .interfaces import ErrorRaisedEvent
 
 

src/Products/SiteErrorLog/tests/testInitialization.py

@@ -17,13 +17,14 @@
 import tempfile
 import unittest
 
-import Products
 from App.config import getConfiguration
 from App.config import setConfiguration
 from OFS.Application import AppInitializer
 from OFS.Application import Application
 from Zope2.Startup.options import ZopeWSGIOptions
 
+import Products
+
 
 test_cfg = """
 instancehome {instance_home}

tox.ini

@@ -39,7 +39,7 @@ basepython = python3.6
 commands_pre =
     mkdir -p {toxinidir}/parts/flake8
 commands =
-    isort --check-only --diff --recursive {toxinidir}/src setup.py
+    isort --check-only --diff {toxinidir}/src setup.py
     - flake8 --format=html src setup.py
     flake8 src setup.py
 deps =
@@ -52,7 +52,6 @@ deps =
     flake8-debugger
     flake8-deprecated
     flake8-todo
-    flake8-isort
     mccabe
     flake8-blind-except
     flake8-commas