Bump up Ansible supported versions

This change bumps up the maximum supported Ansible version to 4.x
(ansible-core 2.11.x) and minimum to 2.10. This synchronises Kayobe with
Kolla Ansible (see change I8b9212934dfab3831986e8db55671baee32f4bbd).

Uses of docker_image are updated. We must now provide the source
parameter. When source is build (for molecule), we replace force by
force_source and force_tag and move path and dockerfile under the build
parameter.

Use docker_image_info instead of docker_image_facts.

Handle update of ansible inside kolla-ansible virtualenv and document
how to do it for the kayobe virtualenv.

Change-Id: I7a4530f4f63ddb37aa30a617db5944b97bc3e17f