* [2.14] fix ci (#7021)

* fix flake8 errors in Kubespray CI - tox-inventory-builder

* fix flake8 errors in Kubespray CI - tox-inventory-builder

* Invalidate CRI-O kubic repo's cache
Signed-off-by: Victor Morales <v.morales@samsung.com>

* add support to configure pkg install retries

and use in CI job tf-ovh_ubuntu18-calico (due to it failing often)

* Switch Calico and Cilium image repos to Quay.io
Co-authored-by: Victor Morales <v.morales@samsung.com>
Co-authored-by: Barry Melbourne <9964974+bmelbourne@users.noreply.github.com>

Conflicts:
	roles/download/defaults/main.yml

* up vagrant box to fedora/33-cloud-base in cri-o molecule tests

(cherry picked from commit 06ec5393)

* add Google proxy-mirror-cache for docker hub to CI tests

(cherry picked from commit d739a6bb)

* containerd docker hub registry mirror support

* containerd docker hub registry mirror support

* add docs

* fix typo

* fix yamllint

* fix indent in sample
and ansible-playbook param in testcases_run

* fix md

* mv common vars to tests/common/_docker_hub_registry_mirror.yml

* checkout vars to upgrade tests

(cherry picked from commit 4a8a52ba

)

* Exclude .git/ from shellcheck

If a branch name contains '.sh', current shellcheck checks the branch
file under .git/ and outputs error because the format is not shell
script one.
This makes shellcheck exclude files under .git/ to avoid this issue.

(cherry picked from commit e2467d87b65ad9050bea022a2d514172520e48f3)
Co-authored-by: Hans Feldt <2808287+hafe@users.noreply.github.com>
Co-authored-by: Sergey <s.bondarev@southbridge.ru>
Co-authored-by: Kenichi Omichi <ken-oomichi@wx.jp.nec.com>

* Switch some image from dockerhub to k8s.gcr (also increase pkg retries) (#6955)

* Set packet_centos8-kube-ovn test to manual
Signed-off-by: Rick Haan <rickhaan94@gmail.com>
Co-authored-by: Etienne Champetier <champetier.etienne@gmail.com>
Co-authored-by: Hans Feldt <2808287+hafe@users.noreply.github.com>
Co-authored-by: Sergey <s.bondarev@southbridge.ru>
Co-authored-by: Kenichi Omichi <ken-oomichi@wx.jp.nec.com>
Co-authored-by: Florian Ruynat <16313165+floryut@users.noreply.github.com>