Fix flake8 errors and warnings

We add the flake8 configuration used so we ensure everyone uses the same.
We remove the usage of __all__ for non public API.
When possible, we rationalize the class name according to its __name__ and module.

issue9082
review297061002

.flake8

@@ -0,0 +1,2 @@
+[flake8]
+ignore=E123,E124,E126,E128,W503

__init__.py

@@ -2,10 +2,10 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-from .res import *
+from . import res
 
 
 def register():
     Pool.register(
-        User,
+        res.User,
         module='ldap_authentication', type_='model')

res.py

@@ -13,8 +13,6 @@ from trytond.pool import PoolMeta
 from trytond.config import config, parse_uri
 from trytond.exceptions import LoginException
 
-__all__ = ['User']
-
 logger = logging.getLogger(__name__)
 section = 'ldap_authentication'
 

setup.py

@@ -79,8 +79,9 @@ setup(name=name,
     keywords='tryton ldap authentication',
     package_dir={'trytond.modules.ldap_authentication': '.'},
     packages=(
-        ['trytond.modules.ldap_authentication'] +
-        ['trytond.modules.ldap_authentication.%s' % p for p in find_packages()]
+        ['trytond.modules.ldap_authentication']
+        + ['trytond.modules.ldap_authentication.%s' % p
+            for p in find_packages()]
         ),
     package_data={
         'trytond.modules.ldap_authentication': (info.get('xml', [])
@@ -93,7 +94,8 @@ setup(name=name,
         'Intended Audience :: Developers',
         'Intended Audience :: Financial and Insurance Industry',
         'Intended Audience :: Legal Industry',
-        'License :: OSI Approved :: GNU General Public License v3 or later (GPLv3+)',
+        'License :: OSI Approved :: '
+        'GNU General Public License v3 or later (GPLv3+)',
         'Natural Language :: Bulgarian',
         'Natural Language :: Catalan',
         'Natural Language :: Chinese (Simplified)',