Migrating to Python v3

 - support for Python v3.8.x
 - support for Python v3.5.x
 - new tag, 2019.2.8
 - updates class generation and iterators
 - unittests updated with coverage >75%
 - new coverage routines
 - unittests profiling
 - full fake data for unittests
 - unittest testrun is ~1.5 seconds long

Bugfixes
 - 34834, proper use of 'sudo' option
 - multiple proper iterator use
 - 37919, show warning when installed and candidate versions
   are newer comparing to release version

Change-Id: Idd6b889f7ce94ae0c832e2f0a0346e4fdc3264a3
Related-PROD: PROD-34834 PROD-34664 PROD-34919
diff --git a/cfg_checker/helpers/tgz.py b/cfg_checker/helpers/tgz.py
index 754f0de..5be00e2 100644
--- a/cfg_checker/helpers/tgz.py
+++ b/cfg_checker/helpers/tgz.py
@@ -50,11 +50,14 @@
         else:
             self.basefile = _filepath
 
-    def get_file(self, name):
+    def get_file(self, name, decode=False):
         if self.has_file(name):
             with tarfile.open(self.basefile, "r:gz") as tgz:
                 _tgzitem = tgz.extractfile(tgz.getmember(name))
-                return _tgzitem.read()
+                if decode:
+                    return _tgzitem.read().decode('utf-8') 
+                else:
+                    return _tgzitem.read()
         else:
             return None