* Fix Failure talking to yum: Cannot find a valid baseurl for repo: base/7/x86_64 if Install packages in CentOS using proxy

* Add proxy to /etc/yum.conf if http_proxy is defined

* Added changes to clean up orphan containers and reload docker & kubelet directories.

* Added new files for cleaning up orphans and docker & kubelet directories

* Added new lines at the end of these files

* removed the trailing whitespaces from main.yml and clean-up.yml

* Updated as per the review comments

* Updated as per the review comments

* Removed service_facts and package_facts because they are not supported in ansible 2.4.0

* Corrected yaml syntax errors

* Removed the use of json_query filter and utilized selectattr

* Removed trailing spaces

* Changed the default value of docker_clean_up to false

* Added Changes to only include cleanup-docker-orphans.sh

* Reverted back changes done inside handler.

* Removed trailing spaces and made default value of docker_orphan_clean_up as true

* Reverted the default value of docker_orphan_clean_up as false

* Made the docker clean up as drop in

* Made the docker clean up as drop in

* Reverted the value of boolean docker_orphan_clean_up to false

* Converted ExecStop to ExecSTartPost. Removed the live restore check from the orphan script

Signed-off-by: mooncake <xcoder@tenxcloud.com>

* Adds support for Multus (multiple interfaces) CNI plugin

Multus is a latin word for "Multi". As the name suggests, it acts as a
Multi plugin in Kubernetes and provides multiple network interface
support in a pod. Multus uses the concept of invoking delegates by
grouping multiple plugins into delegates and invoking them in the
sequential order of the CNI configuration file provided in json format.

* Change CNI version (0.1.0->0.3.1) of Contiv to be compatible with Multus

When using resolvconf_mode host_resolvconf, there is an early DNS
config stage where Kubernetes cluster DNS is not injected for host
DNS intially. Later, the cluster DNS is enabled, but we do not
need to run every task from the kubernetes/preinstall role.

* Added the missing environment for proxy for get_url

* Update upgrade.yml

* Fixed spaces

* Fixed spaces

* Update upgrade.yml

Upstream Changes:

   - coredns v1.2.5 (https://github.com/coredns/coredns/releases/tag/v1.2.5)

NOTE:

   - Switch image repo to https://hub.docker.com/r/coredns/coredns/ (https://github.com/kubernetes-incubator/kubespray/pull/3595#issuecomment-433962973)

Standalone etcd nodes do not generate node-$hostname certs and do
not need this serial calculated.

fix modify the way of the command 'yum remove xxx', e.g. docker-selinux and docker-engine-selinux packages

This reverts commit 8ba6b601.

* do it like in kubernetes/secrets

* fix indentation

* processed comments

* missed one, sorry

* trailing space fix

need set hostname by kubeadm

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

kubeadm sets node label node-role.kubernetes.io/master=''
and this is not configurable. We should use it everywhere.

* codestyle tests

* Download destination can be different than local_release_dir

kube-router v0.2.1 highlights from changelog:
- IPv6 WIP but pretty close to full working functionality
- fully support network policy semantics with addition of support for
  ipblock and except

* warning on meta flush_handlers

* avoid rm

* avoid "Module remote_tmp /root/.ansible/tmp did not exist and was created with a mode of 0700, this may cause issues when running as another user. To avoid this, create the remote_tmp dir with the correct permissions manually" warning on subsequent tasks using blockinfile

* is match

* failed

* version_compare

* succeeded

* skipped

* success

* version_compare becomes version since ansible 2.5

* ansible minimal version updated in doc and spec

* last version_compare