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/modules/reclass/__init__.py b/cfg_checker/modules/reclass/__init__.py
index 2546ec3..adae6df 100644
--- a/cfg_checker/modules/reclass/__init__.py
+++ b/cfg_checker/modules/reclass/__init__.py
@@ -1,21 +1,22 @@
 import os
 
-import comparer
-import validator
-
 from cfg_checker.common import logger_cli
 from cfg_checker.helpers import args_utils
 from cfg_checker.reports import reporter
 
+import comparer
+
+import validator
+
 
 def do_list(args):
     logger_cli.info("# Reclass list")
     _arg_path = args_utils.get_arg(args, 'models_path')
     logger_cli.info("-> Current path is: {}".format(_arg_path))
     _path = args_utils.get_path_arg(_arg_path)
-    
-    logger_cli.info("# ...models path is '{}'".format(args.models_path))
-    
+
+    logger_cli.info("# ...models path is '{}'".format(_path))
+
     models = {}
     for _folder in os.listdir(args.models_path):
         # validate item as a model
@@ -24,15 +25,15 @@
             _folder
         )
         _validated = validator.basic_model_validation_by_path(_model_path)
-        
+
         if not _validated:
             logger_cli.info("-> '{}' not a valid model".format(_folder))
             continue
         else:
             models[_folder] = _model_path
-        
+
         logger_cli.info("-> '{}' at '{}'".format(_folder, _model_path))
-        
+
         # TODO: collect info about the model
 
     return
@@ -44,7 +45,7 @@
     # checking folder params
     _model1 = args_utils.get_path_arg(args.model1)
     _model2 = args_utils.get_path_arg(args.model2)
-    
+
     # Do actual compare using hardcoded model names
     mComparer = comparer.ModelComparer()
 
@@ -52,7 +53,7 @@
     mComparer.model_path_1 = _model1
     mComparer.model_name_2 = os.path.split(_model2)[1]
     mComparer.model_path_2 = _model2
-    
+
     mComparer.load_model_tree(
         mComparer.model_name_1,
         mComparer.model_path_1