I have not yet succeeded in running the new pre-release tests for Indigo on
Trusty.

The web page generated this command for bwi_common:
```

mkdir -p /tmp/prerelease_job
cd /tmp/prerelease_job
generate_prerelease_script.py \
  https://raw.githubusercontent.com/ros-infrastructure/ros_buildfarm_config/master/index.yaml
\
  indigo default ubuntu trusty amd64 \
  bwi_common \
  --level 1 \
  --output-dir ./

```

When I run that and then ./prerelease.sh it fails with these messages:
```
+ docker build -t devel_task_generation__indigo_prerelease .
repository name component must match "[a-z0-9]+(?:[._-][a-z0-9]+)*"
```

As best I can tell, that regexp does not match a string with two '_'
characters in a row.

Any suggestions?
-- 
 joq