turtlebot_simulator: 2.1.1-1 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `turtlebot_simulator` to `2.1.1-1`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.9`
- previous version for package: `2.1.1-0`

## turtlebot_gazebo

```
* Rename cmd_vel_mux as yocs_cmd_vel_mux.
```

## turtlebot_simulator

- No changes