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LFS: GitLab LFS don't provide git-lfs-authenticate command

This command is used for provide LFS-server location and authorization information for SSH users.

Now it's simply whitelisted in gitlab-shell, but don't implement in GitLab LFS server.

Lack of this command is root cause of many troubles described at page http://doc.gitlab.com/ce/workflow/lfs/manage_large_binaries_with_git_lfs.html, for example:

  • getsockopt: connection refused
  • Credentials are always required when pushing an object

For SSH users LFS client:

  • try to get LFS-server information with command like:

ssh git@gitlab.com git-lfs-authenticate gitlab-org/gitlab-ce download

 * try to use requested url and authorization information for LFS-server;
 * on invalid git-lfs-authenticate response try to find LFS-server on default location and ask password from git-credentionals for every request.

Correct git-lfs-authenticate looks like:
```json
{
  "header": {
    "Authorization": "Token SomeAuthData"
  },
  "href": "https://gitlab.com/gitlab-org/gitlab-ce.git/info/lfs"
}

API documentation: https://github.com/github/git-lfs/tree/master/docs/api