Fix vagrant rsync

The git repository contains some blind symlink that cause issues when syncing
with default vagrant rsync setting.

E.g.
Godeps/_workspace/src/github.com/docker/docker/pkg/symlink/testdata/fs/g
is pointing to non-existing path, causing vagrant to fail on:

    rsync error: some files/attrs were not transferred
Merge pull request #464 from iNecas/fix-vagrant-rsync

Merged by openshift-bot