rtabmap and rtabmap_ros: 0.8.0 in hydro/indigo

Increasing version of package(s) in repositories `rtabmap` and  `rtabmap_ros` to `0.8.0` both for Hydro and Indigo distributions.

 - `rtabmap`
  - upstream repository: https://github.com/introlab/rtabmap.git
  - release repository: https://github.com/introlab/rtabmap-release.git
 - `rtabmap_ros`
  - upstream repository: https://github.com/introlab/rtabmap_ros.git
  - release repository: https://github.com/introlab/rtabmap_ros-release.git