[webrunner] use 1.0 branch in slapos repository
branch 1.0 is pinning the following repositories:
- erp5
- vifib
- wendelin
- wendelin.core
- neoppod-repository
For resiliency, it's better to pin the repositories (we want exactly the same software on runner0 and runner1). If people wants to develop inside one of those repositories, they will clone it inside srv/runner/project directory and this will be sync on runner1.