Create route OPTION and GET /v1/projects/:id/git

This task is part of story #7687 REST endpoint to list project's git repositories

Change-Id: I5467f566d243978e60c04fa77e62efa30a0d44c7
Merge commit 'refs/changes/93/3393/6' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Create route OPTION and GET /v1/projects/:id/git

Change-Id: I68b9949d6ee3cbbd18ff18683ed93b5bd3de1c2c
This is Tuleap 7.8.99.23

Change-Id: Ide9f1914cd104e5a507417e50ad32027a902c868