* Upgrade JetStack Cert-Manager to v0.15.2

* Add README.md table of contents

Signed-off-by: Kuralamudhan Ramakrishnan <kuralamudhan.ramakrishnan@intel.com>

- Add 1.17.9 and 1.16.13 SHAs

Signed-off-by: Alvaro Saurin <alvaro.saurin@gmail.com>

* Add oraclelinux8 and disable firewalld

Add oraclelinux8 image and disable firewalld on oraclelinux VMs

* Fix Oracle Linux repositories

As documented in: http://yum.oracle.com/getting-started.html#installing-software-from-oracle-linux-yum-server
public-yum-ol7.repo was deprecated on release 7.6. Some repos were integrated into oracle-linux-ol7.repo (i.e.: ol7_latest, ol7_addons) and other are available as packages (epel). This also adds support for oraclelinux8

* Fix to use ansible_distribution_version

Instead of ansible_distribution_major_version

* Update README.md

Fix the offline docs URL in README

* upgrade calico to 3.14.1

* add checksums for calico 3.14.1 and update readme

https://github.com/containernetworking/plugins/releases/tag/v0.8.6



Signed-off-by: Etienne Champetier <champetier.etienne@gmail.com>

* declare kubic repo for ubuntu

* do not install crictl twice

* move fedora repo modular tasks to crio_repo file

* move centos repo tasks to crio_repo

* declare crio version matrix for ubuntu

* update documentation crio support for ubuntu

Downgrade coredns to 1.6.5 due to upgrade errors while migrating coredns configmap (Corefile) (#5960)

* Add CI_TEST_VARS to tests

* Update flannel to 0.12.0 (with new manifests) and disable tx/rx
offloading in networking test

* fix upgrade of crio on fcos
- update documents

* install conntrack required by kube-proxy
- like commit 48c41bcb

* enable fedora modular repo for crio

* allow to override crio configuration
- set cgroup manager same to kubelet_cgroup_driver if defined
- path of seccomp_profile depends on distribution

* allow to override crio configuration
- fix path for ubuntu

* allow to override crio configuration
- fix cni path for fcos