* Upgrade JetStack Cert-Manager to v0.15.2

* Add README.md table of contents

Nit alert.  Sample inventory throws an error when processed
by yamllint.  The default line is currently commented out.
However, when uncommenting it our linters fail.

* Option for MetalLB to talk BGP

* Check for BGP peers when metallb_protocol is bgp

* README clarification

* Commented values as documentation only in the sample inventory

* layer 2 or BGP, not both

Signed-off-by: Victor Morales <v.morales@samsung.com>

https://github.com/kubernetes/kubeadm/issues/1498 was closed

* log level by default increased to 'info'
* cgroup manager by default set to 'systemd'
* stream port (used by kubelet) bound to 127.0.0.1 for security reasons
* metrics can be enabled and port specified

* Moved docker_dns_options to defaults so it can be overridden

* Fixed yaml indentation and markdown

* Moved docker_dns_search_domains to defaults

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

Signed-off-by: Arthur Outhenin-Chalandre <arthur@cri.epita.fr>

- Add 1.17.9 and 1.16.13 SHAs

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