Why:
Without this modification, we can't use docker with docker_users in same
playbook than the one which install docker.
How:
Check that docker_users are set and not in docker group before include
docker-users.yml. In docker-users.yml we call reset_connection from
ansible.builtin.meta collection after docker-users are added to docker
group.
Manual success tests:
* Try to install docker with only one user in docker-users and not in
docker group => docker-users.yml include
* Try to install docker with only one user in docker-users but the user
is in docker group => docker-users.yml not include
* Try to install docker with 2 users in docker-users, one user in docker
group and the second not => docker-users.yml include
* Try to install docker with 2 users in docker-users, both are in docker
group => docker-users.yml not include
* Try to install docker with 2 users in docker-users, both are not in
docker group => docker-users.yml include
