xacro: 1.9.1-0 in 'indigo/distribution.yaml' [bloom]

Increasing version of package(s) in repository `xacro` to `1.9.1-0`:

- distro file: `indigo/distribution.yaml`
- bloom version: `0.5.10`
- previous version for package: `1.9.0-0`

## xacro

```
* fixup tests so they run
* export architecture_independent flag in package.xml
* installed relocatable fix
* Contributors: Michael Ferguson, Mike Purvis, Scott K Logan
```