log4cpp: 2.7.0-1 in 'hydro/distribution.yaml' [bloom]

Increasing version of package(s) in repository `log4cpp` to `2.7.0-1`:

- distro file: `hydro/distribution.yaml`
- bloom version: `0.5.9`
- previous version for package: `2.7.0-0`

## log4cpp

```
* catkin: added run_depend from catkin to package.xml for released packages
  Signed-off-by: Johannes Meyer <mailto:johannes@intermodalics.eu>
* cmake: added install rule for package.xml
  Signed-off-by: Johannes Meyer <mailto:meyer@fsr.tu-darmstadt.de>
* catkin: add export tag for plain cmake packages
  Signed-off-by: Ruben Smits <mailto:ruben.smits@intermodalics.eu>
* cmake: use cmake_current_binary dir instead of cmake_binary_dir
  Signed-off-by: Ruben Smits <mailto:ruben.smits@intermodalics.eu>
```