Rebalance CI GCE zones for better CPU per region usage

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Add support for cloud-provider based networking

Enable netchecker for CI

* Enable netchecker app for CI postinstall tests
* Rework outputs and better coverage to the ping between pods post
intall test case. With netchecker deployed, the test covers hostnet
to hostnet and standard to standrad pods ping check as well.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Fix kube_version to include 'v' again

https://github.com/kubernetes-incubator/kargo/pull/736 missed this

Address standalone kubelet config case

Allow to let the cloud provider configure proper routing for nodes.

Move kube_version to group_vars/all to allow easier changing of version

Also allows to perform version dependent logic in Ansible roles.

Pass --anonymous-auth to apiserver for 1.5>=

Add Azure Resource Group templates and scripts to contrib

Fixes #732

Fix resolvconf

Also place in global vars and do not repeat the kube_*_config_dir
and kube_namespace vars for better code maintainability and UX.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Do not repeat options and nameservers in the dhclient hooks.
Do not prepend nameservers for dhclient but supersede and fail back
to the upstream_dns_resolvers then default_resolver. Fixes order of
nameservers placement, which is cluster DNS ip goes always first.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>

Fix reverse umount in reset role

The Jinja2 filter 'reverse' returned an iterator instead of a list,
resulting in the umount task to fail.

Intead of using the reverse filter, we use 'tac' to reverse the output
of the previous task.

Better support for CentOS 7 on Azure

remove local deployment from ci

Rework DNS stack to meet hostnet pods needs

Add gitlabci

* For Debian/RedHat OS families (with NetworkManager/dhclient/resolvconf
  optionally enabled) prepend /etc/resolv.conf with required nameservers,
  options, and supersede domain and search domains via the dhclient/resolvconf
  hooks.

* Drop (z)nodnsupdate dhclient hook and re-implement it to complement the
  resolvconf -u command, which is distro/cloud provider specific.
  Update docs as well.

* Enable network restart to apply and persist changes and simplify handlers
  to rely on network restart only. This fixes DNS resolve for hostnet K8s
  pods for Red Hat OS family. Skip network restart for canal/calico plugins,
  unless https://github.com/projectcalico/felix/issues/1185

 fixed.

* Replace linefiles line plus with_items to block mode as it's faster.

Signed-off-by: Bogdan Dobrelya <bdobrelia@mirantis.com>
Co-authored-by: Matthew Mosesohn <mmosesohn@mirantis.com>

Add kubelet and calico CLI info collection

More granular control for download/upload images/binaries

Add playbook and role to reset the cluster