Add copyright info to all python files and bump version

  Related-PROD: PROD-36846

Change-Id: I47c25d81d4173286e1729cef7a1cc321a495316f
diff --git a/cfg_checker/cli/network.py b/cfg_checker/cli/network.py
index 6d3059e..deb8f26 100644
--- a/cfg_checker/cli/network.py
+++ b/cfg_checker/cli/network.py
@@ -1,3 +1,5 @@
+#    Author: Alex Savatieiev (osavatieiev@mirantis.com; a.savex@gmail.com)
+#    Copyright 2019-2022 Mirantis, Inc.
 from .command import cli_command