Support python3 for running tests

Simple change done by 2to3 python tool. Make prints compatible with both
python3 and python2.

Change default version to python3. Still can be run by python2
run_tests.py.

Signed-off-by: Petr Mensik <pemensik@redhat.com>

Author: pemensik

run_tests.py

@@ -1,4 +1,4 @@
-#!/usr/bin/env python2
+#!/usr/bin/env python3
 
 import re
 import sys
@@ -56,17 +56,17 @@ def parse_test(raw):
 
 		failures += 1
 
-		print "="*40
-		print doc
-		print ':'*20
-		print prog, argv
-		print '-'*20
+		print("="*40)
+		print(doc)
+		print(':'*20)
+		print(prog, argv)
+		print('-'*20)
 		if out:
-			print out
-		print error
+			print(out)
+		print(error)
 
 if failures:
-	print "%d failures" % failures
+	print("%d failures" % failures)
 	sys.exit(1)
 else:
-	print "PASS (%d)" % passes
+	print("PASS (%d)" % passes)