* created variable to enable/disable reverse dns lookups in coredns

* fixed linting-error in dns-stack.md

* calico: add constant calico_min_version_required

and verify current deployed version against it.

* calico: remove upgrade support with data migration

The tool was used pre v3.0.0 and is no longer needed.

* calico: remove old version support from tasks

* calico: remove old ver support from policy ctrl

* calico: remove old ver support from node

* canal: remove old ver support

* remove unused calicoctl download checksums

calico_min_version_required is the oldest version that can be installed
Older versions can be removed.

* Add retries to update calico-rr data in etcd through calicoctl

* Update update-node yaml syntax

* Add comment to clarify ansible block loop

* Remove trailing space

If already deployed, get current datastore from CNI config file

* Fix reserved memory unit in kubelet configuration

Signed-off-by: Wang Zhen <lazybetrayer@gmail.com>

* Move systemReserved default values from template

Signed-off-by: Wang Zhen <lazybetrayer@gmail.com>

* Added ability to set calico vxlan vni and port. defaults to calico's documented defaults.

* Check if calico_network_backend is defined prior to checking value

* Removed calico hidden defaults for vxlan port and vni

* Fixed FELIX_VXLANVNI typo

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

* Add external_openstack_lbaas_provider setting for occm

* Integrate with existing lbaas_provider block

* Refactor lbaas_provider config template block

* Remove external_openstack_lbaas_use_octavia from sample inventory

* Added support for setting tiller_service_account and tiller_replicas

* Specify helm 2 version to ensure we have a test path that still hits helm 2 code

* Moved tiller_service_account to defaults.yml. Fixed is tiller_replicas defined check.

Related commit: https://github.com/cilium/cilium/commit/976337b750ac8110b128fa25105e2fcc91ccd223

Remove configuration variable kubeadm_control_plane

* kube-proxy never gets deployed so need to remove it

* Make metallb image repos configurable

* Moved metallb image repo definitions to download role defaults

* Removed comment. These are set in download defaults