Comment 4 for bug 1754498

Reviewed: https://review.openstack.org/557777
Committed: https://git.openstack.org/cgit/openstack/tripleo-quickstart/commit/?id=dad6bee340fa15b07cfddcdd79e58ab070c0549d
Submitter: Zuul
Branch: master

commit dad6bee340fa15b07cfddcdd79e58ab070c0549d
Author: Mike Fedosin <email address hidden>
Date: Thu Mar 29 19:03:39 2018 +0200

    Allow to clone extras if zuul cloner is not presented

    Now zuul cloner executable is required to clone quickstart-extras.
    If it's not presented the deployment fails with:
    ERROR! .quickstart/playbooks/quickstart-extras.yml could not be found

    This patch allows to clone the repository anyway with the standard git
    command.

    Change-Id: Idc7d59ecffbdaa38c35f44dfef5891b8fb6e199a
    Closes-bug: #1754498