Bug 1473262 - [wptrunner] Use host 127.0.0.1 Marionette executor to connect to Marionette. r=ato

MozReview-Commit-ID: 1OeCMlg6I2

--HG--
extra : rebase_source : de656c465c9e18a8a8c540c27a71c461c9978f5f

testing/web-platform/tests/tools/wptrunner/wptrunner/executors/executormarionette.py

@@ -401,7 +401,7 @@ class MarionetteProtocol(Protocol):
     def connect(self):
         self.logger.debug("Connecting to Marionette on port %i" % self.marionette_port)
         startup_timeout = marionette.Marionette.DEFAULT_STARTUP_TIMEOUT * self.timeout_multiplier
-        self.marionette = marionette.Marionette(host='localhost',
+        self.marionette = marionette.Marionette(host='127.0.0.1',
                                                 port=self.marionette_port,
                                                 socket_timeout=None,
                                                 startup_timeout=startup_timeout)