Unable to sync with git:// protocol

```
What steps will reproduce the problem?
1. repo init -u https://gitorious.org/rowboat/manifest.git
2. repo sync

What is the expected output? What do you see instead?
The source code should be downloaded, but it is not.

Please provide any additional information below.
It seems that since Gitorious announced it was closing, repositories cannot be
accessed anymore using the git:// protocol, which is used by default in the
manifest files. A workaround consists of moving to https protocol, but the
real solution would be to migrate to another code hosting platform.
```

Original issue reported on code.google.com by `vleclem...@gmail.com` on 12 Mar 2015 at 3:44

Start by reproducing the failure with `repo init -u https://gitorious.org/rowboat/manifest.git` followed by `repo sync`. Inspect the manifest files for repositories using the `git://` protocol and determine the supported replacement hosting or protocol. Done means the manifest repositories can be downloaded successfully with `repo sync`.

Written by the indexing model from the issue text.