corrected error in test shows by travis

Build error in travis https://travis-ci.org/sindice/sparqled/jobs/25598843

```
java.net.ConnectException: Connection refused
  at java.net.PlainSocketImpl.socketConnect(Native Method)
  at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:327)
  at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:193)
  at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:180)
  at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:385)
  at java.net.Socket.connect(Socket.java:546)
  at java.net.Socket.connect(Socket.java:495)
  at java.net.Socket.<init>(Socket.java:392)
  at java.net.Socket.<init>(Socket.java:266)
...
```