Fix some compatibility issues with Python3

tests/tools_not_linked_usr/tools_not_linked_usr.py

@@ -14,7 +14,6 @@
 #
 # Author: Bruno Goncalves <bgoncalv@redhat.com>
 
-from os import walk
 import subprocess
 import sys
 import re
@@ -25,7 +24,10 @@ def run(cmd):
     stdout, stderr = p.communicate()
 
     retcode = p.returncode
-    output = stdout + stderr
+    output = stdout.decode('ascii', 'ignore') + stderr.decode('ascii', 'ignore')
+
+    # remove new line from last line
+    output = output.rstrip()
     print(output)
     return retcode, output