Update latest GitLab.

M  gitlab/gitlab.yml.tpl:
  Update config, add some settings yet to be taken into account
M nxlog/nxlog.conf.tpl:
  uses 'USERGROUP' instead of 'GROUPNAME'
M sbin/usrcmd/repl_tpl
  uses 'USERGROUP' instead of 'GROUPNAME'
A gitolite/src
  Tries to respect default gitlab gitolite installation path
  (repos_path/../gitolite/src)