[java] Adding a debug message to figure out why selenium server can't start geckodriver on travis

Author: barancev

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

@@ -183,6 +183,7 @@ public void start() throws IOException {
       }
       process = new CommandLine(this.executable, args.toArray(new String[] {}));
       process.setEnvironmentVariables(environment);
+      System.out.println("Starting " + process);
       process.copyOutputTo(getOutputStream());
       process.executeAsync();