Remove chef and vagrant stuff from repository

Vagrant and chef stuff clutter the source repository, there is no reason
they are so strongly coupled with it.
Therefore, this commit extracts those two elements in 2 dedicated repo:
* Chef cookbook: https://tuleap.net/plugins/git/index.php/101/view/157/
* Vagrant setup: https://tuleap.net/plugins/git/index.php/101/view/69/

There are 2 repositories because vagrant is one stuff for development
but chef cookbook can be reused outside the context of vagrant, to deploy
lxc machines or even productions servers.

Change-Id: I5438f1f464986830ea4048b262d1ea84a8547dec
Merge commit 'refs/changes/39/1639/1' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Remove chef and vagrant stuff from repository

Change-Id: I658a4a9f87a8dd74e906ecc79e239618a329c2e4
Tuleap 6.9.99.2

Change-Id: I3312958301f2389eaeefcb3792376bf8ea3b7e48