Fix version comparison

Fix default_resolver is undefined

fix issues #2265

Add optional StorageClass name with cephfs_provisioner_storage_class

`FAILED! => {"changed": false, "msg": "AnsibleFilterError: Version comparison: unorderable types: str() < int()"}`

Making node status and scheduling detection mo betta for upgrades

Fix safe upgrade

Tokens are generated automatically during init process and on-demand for nodes joining process

Even though there it kubeadm_token_ttl=0 which means that kubeadm token never expires, it is not present in `kubeadm token list` after cluster is provisioned (at least after it is running for some time) and there is issue regarding this https://github.com/kubernetes/kubeadm/issues/335, so we need to create a new temporary token during the cluster upgrade.

Added missing cephfs_provisioner_enabled to kubespray-defaults vars

Local volume provisioner fixes

Add cephfs_provisioner Support for Kubespray

baremetal tweaks

Always set net.bridge.bridge-nf-call-* sysctl

Disalbe install epel-release rpm on Centos/Redhat

kubernetes-apps: retry get default token name

 Support multiple inventory files under individual inventory directory

Fix symlinking vagrant inventory

Adding metrics-server support for K8s version 1.9

Make the Kubelet read-only port configurable and disable it by default

The default path assumes that the vagrant dir is called 'inventory'.
With custom defined inventory dirs that are not called 'inventory' this
fails to create the correct symlink under .vagrant.d.

local_volume_provisioner_enabled replacement

In some installation, it can take up to 3sec to get the value. Retrying
for 5 sec will ensure the command won't return 1.

Signed-off-by: Sébastien Han <seb@redhat.com>

etcd: ability to enable/disable ETCD_PEER_CLIENT_CERT_AUTH

Rename from aggregator-proxy-client to front-proxy-client to match kubeadm design. Added kubeadm support too. Changed to use variables set and not hardcode paths. Still missing cert generation for Vault