tests: don't use print() to create wcs config files (py3)

tests/test_wcs.py

@@ -182,15 +182,15 @@ combo = combo
         fd.close()
 
     with open(os.path.join(WCS_DIR, 'wcs.cfg'), 'w') as fd:
-        print >> fd, '''[main]
-app_dir = %s''' % WCS_DIR
+        fd.write('''[main]
+app_dir = %s\n''' % WCS_DIR)
 
     with open(os.path.join(WCS_DIR, 'local_settings.py'), 'w') as fd:
-        print >> fd, '''
+        fd.write('''
 WCS_LEGACY_CONFIG_FILE = '%s/wcs.cfg'
 THEMES_DIRECTORY = '/'
 ALLOWED_HOSTS = ['127.0.0.1', '127.0.0.2']
-''' % WCS_DIR
+''' % WCS_DIR)
 
     WCS_PID = os.fork()
     if not WCS_PID: