* Limit the maximum number of revisions saved per helm release

Changed /etc/systemd/system/docker.service.d/docker-options.conf file for successful parsing mount aguments
try fix ci error previous commit

fix error message: '[/etc/systemd/system/docker.service.d/docker-options.conf:3] Failed to parse mount flag , ignoring.'

The number of pods on a given node is determined by the  --max-pods=k
directive. When the address space is exhausted, no more pods can be
scheduled even if from the --max-pods-perspective, the node still has
capacity.

The special case that a pod is scheduled and uses the node IP in the
host network namespace is too "soft" to derive a guarantee.

Comparing kubelet_max_pods with kube_network_node_prefix when given
allows to assert that pod limits match the CIDR address space.

* Upgrade k8s to 1.10.2

Bumped etcd version to 3.2.16 as recommended

* Add ipvs fix for v1.10

* change flannel addons test to ha

Upgrade kube-dns to 1.14.10
https://github.com/kubernetes/kubernetes/tree/master/cluster/addons/dns

Almost certainly, the .kube/config file (YAML) should not be executable.

* Move front-proxy-client certs back to kube mount

We want the same CA for all k8s certs

* Refactor vault to use a third party module

The module adds idempotency and reduces some of the repetitive
logic in the vault role

Requires ansible-modules-hashivault on ansible node and hvac
on the vault hosts themselves

Add upgrade test scenario
Remove bootstrap-os tags from tasks

* fix upgrade issues

* improve unseal logic

* specify ca and fix etcd check

* Fix initialization check

bump machine size