options: Remove parsing --verbose from the configuration file

The `--verbose` option is only used by `flake8`, itself,` when parsing
and handling preliminary options.  After parsing and merging options
from the configuration file, there is no other behavioral impact to the
core of `flake8`.  In other words, setting `verbose = ...` in a
configuration file doesn't change the logging verbosity.

While the `FileProcessor` does expose a `verbose` attribute, obtained
from the parsed options, the verbosity of the core of `flake8` should be
consistent with how a plugin may respond to the attribute's value.

docs/source/user/options.rst

@@ -155,13 +155,7 @@ Options and their Descriptions
 
         flake8 -vv
 
-    This **can** be specified in config files.
-
-    Example config file usage:
-
-    .. code-block:: ini
-
-        verbose = 2
+    This **can not** be specified in config files.
 
 
 .. option:: -q, --quiet

src/flake8/main/options.py

@@ -48,7 +48,6 @@ def register_default_options(option_manager):
         "--verbose",
         default=0,
         action="count",
-        parse_from_config=True,
         help="Print more information about what is happening in flake8."
         " This option is repeatable and will increase verbosity each "
         "time it is repeated.",

tests/fixtures/config_files/cli-specified.ini

@@ -7,5 +7,4 @@ exclude =
     foo/,
     bar/,
     bogus/
-verbose = 2
 quiet = 1

tests/unit/test_merged_config_parser.py

@@ -27,8 +27,6 @@ def test_parse_cli_config(optmanager, config_finder):
                           normalize_paths=True)
     optmanager.add_option('--ignore', parse_from_config=True,
                           comma_separated_list=True)
-    optmanager.add_option('--verbose', parse_from_config=True,
-                          action='count')
     optmanager.add_option('--quiet', parse_from_config=True,
                           action='count')
     parser = config.MergedConfigParser(optmanager, config_finder)
@@ -43,7 +41,6 @@ def test_parse_cli_config(optmanager, config_finder):
             os.path.abspath('bar/'),
             os.path.abspath('bogus/'),
         ],
-        'verbose': 2,
         'quiet': 1,
     }
 
@@ -68,8 +65,6 @@ def test_parse_user_config(optmanager, config_finder):
                           normalize_paths=True)
     optmanager.add_option('--ignore', parse_from_config=True,
                           comma_separated_list=True)
-    optmanager.add_option('--verbose', parse_from_config=True,
-                          action='count')
     optmanager.add_option('--quiet', parse_from_config=True,
                           action='count')
     parser = config.MergedConfigParser(optmanager, config_finder)
@@ -85,7 +80,6 @@ def test_parse_user_config(optmanager, config_finder):
             os.path.abspath('bar/'),
             os.path.abspath('bogus/'),
         ],
-        'verbose': 2,
         'quiet': 1,
     }
 
@@ -97,8 +91,6 @@ def test_parse_local_config(optmanager, config_finder):
                           normalize_paths=True)
     optmanager.add_option('--ignore', parse_from_config=True,
                           comma_separated_list=True)
-    optmanager.add_option('--verbose', parse_from_config=True,
-                          action='count')
     optmanager.add_option('--quiet', parse_from_config=True,
                           action='count')
     parser = config.MergedConfigParser(optmanager, config_finder)
@@ -116,7 +108,6 @@ def test_parse_local_config(optmanager, config_finder):
             os.path.abspath('bar/'),
             os.path.abspath('bogus/'),
         ],
-        'verbose': 2,
         'quiet': 1,
     }