Updated setup to reference the gitlab-shell var

-Well really it uses what everything else uses -- would be nice to have this as a specific config var

Change-Id: I08cef6080950bf40360b461abd2535ea8890410d
Merge pull request #3583 from karlhungus/update_dev_setup_to_not_use_hard_coded_path_to_gitlab_shell

Updated setup to reference the gitlab-shell var