rosnode list still shows nodes that are actually stopped

[andresv]

1. start roscore
2. start your rosrust node cargo run.
3. run rosnode list and verify that node is in there
4. stop your node
5. run rosnode list this node should be gone from the list, but it is still there
6. run rosnode ping yournode no answer

It seems that roscore does not get information about node being killed. It works as expected with cpp nodes.

I tested it on rosrust 0.9.0 on ROS indigo.