Cloud Config: Project Name can contain colons and that trips some of the commands.

If a project is created inside an organization, for example foo.com, the project name will be `foo.com:project`, and some commands in the documentation don't like that.

https://google.github.io/fuzzbench/running-a-cloud-experiment/setting-up-a-google-cloud-project/

In particular, it seems like the `gcr.io` urls need to be rewritten from `gcr.io/organization:project/` to `gcr.io/organization/project/`, but I am not sure.