rospack: 2.2.3-1 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `rospack` to `2.2.3-1`:

- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.8`
- previous version for package: `2.2.3-0`

## rospack

```
* find library for exact Python version (even if not in CMake provided list of version numbers) (#40 <https://github.com/ros/rospack/issues/40>)
* find TinyXML using cmake_modules (#24 <https://github.com/ros/rospack/issues/24>)
* make error messages tool specific (rospack vs. rosstack) (#38 <https://github.com/ros/rospack/issues/38>)
```