Sending geckodriver logs to stderr by default. Default log level is l…

…ow enough, so the log does not look polluted. Ufortunately, geckodriver does not allow to separate its own log from the browser logs, so messages from the browser log can appear in the log even on the lowest level.

java/client/src/org/openqa/selenium/firefox/GeckoDriverService.java

@@ -178,7 +178,7 @@ protected GeckoDriverService createDriverService(File exe, int port,
             // TODO: This stream is leaked.
             service.sendOutputTo(new FileOutputStream(getLogFile()));
           } else {
-            service.sendOutputTo(ByteStreams.nullOutputStream());
+            service.sendOutputTo(System.err);
           }
         }
         return service;

java/client/src/org/openqa/selenium/remote/service/DriverService.java

@@ -234,6 +234,10 @@ protected boolean hasShutdownEndpoint() {
     return true;
   }
 
+  /**
+   * @deprecated Visibility will be restricted to 'protected' soon.
+   */
+  @Deprecated
   public void sendOutputTo(OutputStream outputStream) {
     this.outputStream = Preconditions.checkNotNull(outputStream);
   }