Remove implicitly created Network Wrapper Servers (NWSs) by gazebo-yarp-plugins in the future

[traversaro]

Hi everyone! In gazebo-yarp-plugins repo there is an issue that could be interesting for the community:
robotology/gazebo-yarp-plugins#569 . The discussion is happening there, but this discussion is to make everyone that watches robotology/community aware of this discussion.

cc @robotology/everyone