Make gtester-report compatible with Python 3

Convert tabs to spaces and replace print with print().
The script still works with Python 2.x.

https://bugzilla.gnome.org/show_bug.cgi?id=696324

glib/gtester-report

@@ -464,7 +464,7 @@ def parse_opts():
             " Needs python-subunit]")
     options, files = parser.parse_args()
     if options.version:
-        print parser.epilog
+        print(parser.epilog)
         return None, None
     if len(files) != 1:
         parser.error("Must supply a log file to parse.")