* [contrib/terraform/openstack] Add worker_allowed_ports

  Allow user to define in terraform template which ports and remote
  IPs that are allowed to access worker nodes. This is useful when you
  don't want to open up whole NodePort range to the outside world, or
  ports outside NodePort range.

Correct the wrong word

typo fix about officially

Signed-off-by: Yongxin Li <yxli@alauda.io>

Fix some typos

Signed-off-by: Rui Cao <ruicao@alauda.io>

Revert "CoreDNS v1.2.5 (#3595)"

* Add an 'access_ip' for openstack resources to the terraform inventory builder script

* Update Openstack README

* Only use ipv4

* If there's a floating IP assigned to an openstack instance, use that for access_ip

This reverts commit 8ba6b601.

* do it like in kubernetes/secrets

* fix indentation

* processed comments

* missed one, sorry

* trailing space fix

Fix typo

need set hostname by kubeadm

Update vsphere.md

Fix some typos

fix typo

[contrib/terraform/openstack] Add support for router less deployments

Add bin_dir to kubectl version check

Upstream Changes:

-   ingress-nginx 0.20.0 (https://github.com/kubernetes/ingress-nginx/releases/tag/nginx-0.20.0)

Our Changes:

-   Sync templates with upstream changes