fix issues #2265

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

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.

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>

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

1.Disalbe install epel-release rpm on Centos/Redhat
2.Use yum install epel-release

* allow installs to not have hostname overriden with fqdn from inventory
* calico-config no longer requires local as and will default to global
* when cloudprovider is not defined, use the inventory_hostname for cni-calico
* allow reset to not restart network (buggy nodes die with this cmd)
* default kube_override_hostname to inventory_hostname instead of ansible_hostname

The PR #2203 add's missing defaults for weave, but no signed CLA. So this PR fixes it.

In PR #2244 the `registry_enabled` is missing in defaults, causing a deployment to fail, if it is not set in k8s-cluster.yml