look for repos in subdir

in case repo was defined as a path eq. vendor/repo

Signed-off-by:Eric Villard <dev@eviweb.fr>
add helper class for repo in subdir

Signed-off-by:Eric Villard <dev@eviweb.fr>
apply feature to all services

Signed-off-by:Eric Villard <dev@eviweb.fr>
refactoring: subdir lookup is now asynchronous

Signed-off-by:Eric Villard <dev@eviweb.fr>
Merge pull request #2 from eviweb/feature/repo-in-subdir

enhancement : target also repositories located in config.gitdir sub directories