WARNING: this is a first step story in order to put things together. At the end of this story, there is no fine grain permissions yet.
- New UI (tab) in git admin to define default git permissions
- Those defaults are stored in DB
- This default is used when several repositories are forked
- fix bug when one of the source is a gerrit repo
- The template is used when a repository is created
- The template is inherited at project creation