Fix typo in aws.md docs

rollback to a two stage CI

Remove redundant python-apt install

"kubernetes" is spelled wrong in the cluster tag example

Additional CI platform (digital-ocean)

Fix bug issues #2289

This updated scenario ensures deployment still passes without
having any group_vars available.

Update default CONFIG_FILE for contrib/inventory_builder/inventory.py

Increased timeout values for k8s API server restart

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

Ansible automatically installs the python-apt package when using
the 'apt' Ansible module, if python-apt is not present. This patch
removes the (unneeded) explicit installation in the Kubespray
'preinstall' role.

Local volume provisioner fixes