roseus/test/test-tf.test: tf2_buffer_server output to screen

currently it fails on ros build firm although travis said it is ok.

```
[0m[32mwait-for-transform at #<ros::time #X5cddbe8 0.000> returns t
[0m[32mswitch target to /TOKYO
[0m[32mswitch target to /JUPITER
[0m;; gc 4708923 5462400
0 gc:(4708923 5462400), vmrss:63656
[32mswitch target to /TOKYO
[0m[31m[ERROR] [1395987460.593371448]: The LookupTransform goal sent to the BufferServer did not come back in the specified time. Something is likely wrong with the server.[0m
[31m[ERROR] test (and c (eps= (norm (send c :difference-position c1)) 0) (eps= (norm (send c :difference-rotation c1)) 0)) failed ... (tf2: lookup-transform failed nil #<coordinates #X5adc3e8  1000.0 0.0 0.0 / 0.0 0.0 0.0> [0mmswitch target to /TOKYO
:63656
me #X5cddbe8 0.000&gt; returns t
```

[1] http://jenkins.ros.org/job/prerelease-hydro-jsk_roseus/ARCH_PARAM=amd64,UBUNTU_PARAM=precise,label=prerelease/