Network check fixes

- Proper network mapping
- Proper reclass lookup
- VIP detection
- Simple error gathering
- IP shown as 'exploded', i.e. in CIDR format
- MTU matching and detection
- Errors class for handling errors, including codes and indices
- Summary and detailed errors view
- Flake8 refactoring

Change-Id: I8ee37d345bdc21c7ad930bf8305acd28f8c121c8
Related-PROD: PROD-28199
diff --git a/cfg_checker/common/settings.py b/cfg_checker/common/settings.py
index 8d8111c..33e7c25 100644
--- a/cfg_checker/common/settings.py
+++ b/cfg_checker/common/settings.py
@@ -1,7 +1,9 @@
 import os
 
 from exception import ConfigException
-from log import logger, logger_cli
+
+from log import logger_cli
+
 from other import utils
 
 pkg_dir = os.path.dirname(__file__)
@@ -74,7 +76,11 @@
         if os.path.isfile(_config_path):
             with open(_config_path) as _f:
                 _list = _f.read().splitlines()
-            logger_cli.info("# Loading env vars from '{}'".format(_config_path))
+            logger_cli.info(
+                "# Loading env vars from '{}'".format(
+                    _config_path
+                )
+            )
         else:
             raise ConfigException(
                 "# Failed to load enviroment vars from '{}'".format(
@@ -103,7 +109,11 @@
                 )
             )
         else:
-            logger_cli.debug("-> ...loaded total of '{}' vars".format(len(_list)))
+            logger_cli.debug(
+                "-> ...loaded total of '{}' vars".format(
+                    len(_list)
+                )
+            )
             self.salt_env = _env_name
 
     def __init__(self):