igt: transfer print-test-result.py to be Python3 script

Transfer print-test-result.py to be Python3 script, because Python2 has
already been EOL.

Signed-off-by: Arthur She <arthur.she@linaro.org>
diff --git a/automated/linux/igt/print-test-result.py b/automated/linux/igt/print-test-result.py
index 42a939d..c6da5c9 100755
--- a/automated/linux/igt/print-test-result.py
+++ b/automated/linux/igt/print-test-result.py
@@ -1,28 +1,27 @@
-#!/usr/bin/python
+#!/usr/bin/python3
 import argparse
 import sys
 import json
 
 
 def print_result(results):
-    for test, content in results['tests'].iteritems():
-        content = {k: unicode(v).encode("utf-8") for k, v in content.iteritems()}
-        print '<LAVA_SIGNAL_STARTTC %s>' % test
-        print '************************************************************************************************************************************'
-        print '%-15s %s' % ('Test:', test)
-        print '%-15s %s' % ('Result:', content['result'])
+    for test, content in results['tests'].items():
+        print('<LAVA_SIGNAL_STARTTC %s>' % test)
+        print('************************************************************************************************************************************')
+        print('%-15s %s' % ('Test:', test))
+        print('%-15s %s' % ('Result:', content['result']))
         # Test result generated by igt_runner doesn't have the following values
         try:
-            print '%-15s %s' % ('Command:', content['command'])
-            print '%-15s %s' % ('Environment:', content['environment'])
-            print '%-15s %s' % ('Returncode:', content['returncode'])
+            print('%-15s %s' % ('Command:', content['command']))
+            print('%-15s %s' % ('Environment:', content['environment']))
+            print('%-15s %s' % ('Returncode:', content['returncode']))
         except KeyError:
             pass
-        print '%-15s %s' % ('Stdout:', content['out'].replace('\n', '\n                '))
-        print '%-15s %s' % ('Stderr:', content['err'].replace('\n', '\n                '))
-        print '%-15s %s' % ('dmesg:', content['dmesg'].replace('\n', '\n                '))
-        print '<LAVA_SIGNAL_TESTCASE TEST_CASE_ID=%s RESULT=%s>' % (test, content['result'])
-        print '<LAVA_SIGNAL_ENDTC %s>' % test
+        print('%-15s %s' % ('Stdout:', content['out'].replace('\n', '\n                ')))
+        print('%-15s %s' % ('Stderr:', content['err'].replace('\n', '\n                ')))
+        print('%-15s %s' % ('dmesg:', content['dmesg'].replace('\n', '\n                ')))
+        print('<LAVA_SIGNAL_TESTCASE TEST_CASE_ID=%s RESULT=%s>' % (test, content['result']))
+        print('<LAVA_SIGNAL_ENDTC %s>' % test)
 
 
 if __name__ == '__main__':