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/const.py b/cfg_checker/common/const.py
index 8ca0d8c..f1f69ae 100644
--- a/cfg_checker/common/const.py
+++ b/cfg_checker/common/const.py
@@ -1,7 +1,7 @@
 """Constants that is not to be changed and used in all other files
 """
 
-from __future__ import print_function, absolute_import
+from __future__ import absolute_import, print_function
 
 import itertools