Reduce INFO output at initialization

There is too much output to INFO when IKFast loads. This PR removes:

```
 INFO ros.baxter_ikfast_left_arm_plugin.ikfast: left_s0 -1.70168 1.70168 1
 INFO ros.baxter_ikfast_left_arm_plugin.ikfast: left_s1 -2.147 1.047 1
 INFO ros.baxter_ikfast_left_arm_plugin.ikfast: left_e0 -3.05418 3.05418 1
 INFO ros.baxter_ikfast_left_arm_plugin.ikfast: left_e1 -0.05 2.618 1
 INFO ros.baxter_ikfast_left_arm_plugin.ikfast: left_w0 -3.059 3.059 1
 INFO ros.baxter_ikfast_left_arm_plugin.ikfast: left_w1 -1.5708 2.094 1
 INFO ros.baxter_ikfast_left_arm_plugin.ikfast: left_w2 -3.059 3.059 1
```