Update to fix junit results on python3

The same result that was put in place for regular xml results is also
needed for the junit results when running with python3.

Client/src/bkr/client/commands/cmd_job_results.py

@@ -138,6 +138,9 @@ def run(self, *args, **kwargs):
                     self.parser.error('JUnit XML format is only available for jobs')
                 response = requests_session.get('jobs/%s.junit.xml' % id)
                 response.raise_for_status()
-                print(response.content)
+                str_xml = response.content
+                if six.PY3:
+                    str_xml = str_xml.decode('utf-8')
+                print(str_xml)
             else:
                 raise RuntimeError('Format %s not implemented' % format)