Fix remaining lint issues

[kadler]

• [ ] C901 'DatabaseWrapper.get_connection_params' is too complex (21)
• [ ] E501 line too long (159 > 127 characters)
• [ ] E711 comparison to None should be 'if cond is None:'
• [ ] E712 comparison to True should be 'if cond is True:' or 'if cond:'
• [ ] E722 do not use bare 'except'
• [ ] F401 'sys' imported but unused
• [ ] F504 '...' % ... has unused named argument(s): column, table
• [ ] F841 local variable 'pconnect_flag' is assigned to but never used
• [ ] W291 trailing whitespace

./django_ibmi/operations.py:26:1: F401 'sys' imported but unused
./django_ibmi/operations.py:35:1: F401 'django.utils.timezone.is_naive' imported but unused
./django_ibmi/operations.py:49:20: W291 trailing whitespace
./django_ibmi/operations.py:289:128: E501 line too long (143 > 127 characters)
./django_ibmi/operations.py:291:128: E501 line too long (148 > 127 characters)
./django_ibmi/operations.py:324:128: E501 line too long (173 > 127 characters)
./django_ibmi/operations.py:325:128: E501 line too long (205 > 127 characters)
./django_ibmi/operations.py:328:128: E501 line too long (154 > 127 characters)
./django_ibmi/operations.py:331:54: W291 trailing whitespace
./django_ibmi/operations.py:333:71: W291 trailing whitespace
./django_ibmi/operations.py:350:128: E501 line too long (186 > 127 characters)
./django_ibmi/operations.py:353:54: W291 trailing whitespace
./django_ibmi/operations.py:355:71: W291 trailing whitespace
./django_ibmi/operations.py:371:128: E501 line too long (163 > 127 characters)
./django_ibmi/operations.py:386:39: E711 comparison to None should be 'if cond is not None:'
./django_ibmi/operations.py:411:34: E711 comparison to None should be 'if cond is None:'
./django_ibmi/operations.py:432:34: E711 comparison to None should be 'if cond is None:'
./django_ibmi/query.py:25:1: C901 'query_class' is too complex (17)
./django_ibmi/schemaEditor.py:19:1: F401 'sys' imported but unused
./django_ibmi/schemaEditor.py:32:1: F401 'django.db.utils.ProgrammingError' imported but unused
./django_ibmi/schemaEditor.py:43:128: E501 line too long (161 > 127 characters)
./django_ibmi/schemaEditor.py:44:128: E501 line too long (132 > 127 characters)
./django_ibmi/schemaEditor.py:101:5: C901 'DB2SchemaEditor.alter_field' is too complex (60)
./django_ibmi/schemaEditor.py:125:128: E501 line too long (190 > 127 characters)
./django_ibmi/schemaEditor.py:138:128: E501 line too long (161 > 127 characters)
./django_ibmi/schemaEditor.py:189:128: E501 line too long (131 > 127 characters)
./django_ibmi/schemaEditor.py:193:34: F504 '...' % ... has unused named argument(s): column, table
./django_ibmi/schemaEditor.py:209:34: F504 '...' % ... has unused named argument(s): column, table
./django_ibmi/schemaEditor.py:223:34: F504 '...' % ... has unused named argument(s): column, table
./django_ibmi/schemaEditor.py:420:13: E722 do not use bare 'except'
./django_ibmi/schemaEditor.py:512:5: C901 'DB2SchemaEditor.add_field' is too complex (14)
./django_ibmi/schemaEditor.py:636:5: C901 'DB2SchemaEditor._defer_constraints_check' is too complex (14)
./django_ibmi/schemaEditor.py:636:128: E501 line too long (177 > 127 characters)
./django_ibmi/schemaEditor.py:653:21: E722 do not use bare 'except'
./django_ibmi/schemaEditor.py:663:21: E722 do not use bare 'except'
./django_ibmi/introspection.py:19:1: F401 'sys' imported but unused
./django_ibmi/introspection.py:21:1: F401 'pyodbc' imported but unused
./django_ibmi/introspection.py:26:5: F401 'django.db.backends.base.introspection.FieldInfo' imported but unused
./django_ibmi/introspection.py:136:5: C901 'DatabaseIntrospection.get_constraints' is too complex (18)
./django_ibmi/introspection.py:142:128: E501 line too long (139 > 127 characters)
./django_ibmi/introspection.py:164:128: E501 line too long (284 > 127 characters)
./django_ibmi/introspection.py:167:128: E501 line too long (260 > 127 characters)
./django_ibmi/introspection.py:170:128: E501 line too long (265 > 127 characters)
./django_ibmi/introspection.py:234:9: F401 'django.apps.apps' imported but unused
./django_ibmi/compiler.py:20:1: F401 'sys' imported but unused
./django_ibmi/compiler.py:28:5: C901 'SQLCompiler.as_sql' is too complex (17)
./django_ibmi/compiler.py:33:128: E501 line too long (159 > 127 characters)
./django_ibmi/compiler.py:138:32: E712 comparison to True should be 'if cond is True:' or 'if cond:'
./django_ibmi/client.py:28:1: F401 'types' imported but unused
./django_ibmi/base.py:23:1: F401 'sys' imported but unused
./django_ibmi/base.py:44:1: F401 'django.db.backends.signals.connection_created' imported but unused
./django_ibmi/base.py:127:79: W291 trailing whitespace
./django_ibmi/base.py:174:5: C901 'DatabaseWrapper.get_connection_params' is too complex (21)
./django_ibmi/base.py:245:5: C901 'DatabaseWrapper.get_new_connection' is too complex (12)
./django_ibmi/base.py:299:13: F841 local variable 'pconnect_flag' is assigned to but never used
./django_ibmi/base.py:307:13: F841 local variable 'schema' is assigned to but never used
./django_ibmi/base.py:356:16: E711 comparison to None should be 'if cond is None:'
./django_ibmi/base.py:382:5: C901 'DB2CursorWrapper.execute' is too complex (11)
./django_ibmi/creation.py:20:1: F401 'pyodbc' imported but unused
./django_ibmi/creation.py:26:1: F401 'django.conf.settings' imported but unused
./django_ibmi/creation.py:39:128: E501 line too long (130 > 127 characters)
./django_ibmi/creation.py:41:128: E501 line too long (129 > 127 characters)
./django_ibmi/creation.py:90:128: E501 line too long (131 > 127 characters)
./django_ibmi/creation.py:122:128: E501 line too long (170 > 127 characters)
./django_ibmi/creation.py:139:128: E501 line too long (154 > 127 characters)
./django_ibmi/creation.py:140:128: E501 line too long (163 > 127 characters)
./django_ibmi/creation.py:141:5: C901 'DatabaseCreation.create_test_db' is too complex (18)
./django_ibmi/creation.py:174:128: E501 line too long (134 > 127 characters)
./django_ibmi/creation.py:177:128: E501 line too long (134 > 127 characters)

[kadler]

Closed by #33 other than the C901 issues