Implement all remaining deprecations for 3.0.0 (#400)

* Remove support for Ansible 2.9 and ansible-base 2.10.

* Remove Ansible 2.9 compatiblity code.

* Remove docker-compose from EE.

* Drop support for Python 2.6. Stop advertising docker-py for Python 2.6.

* Drop support for API versions 1.20 to 1.24.

* Fix condition.

tests/ee/roles/docker_compose/tasks/main.yml

@@ -1,34 +0,0 @@
----
-# Create random name prefix (for containers, networks, ...)
-- name: Create random container name prefix
-  set_fact:
-    cname_prefix: "{{ 'ansible-docker-test-%0x' % ((2**32) | random) }}"
-
-- name: Create project and container names
-  set_fact:
-    pname: "{{ cname_prefix }}"
-    cname: "{{ cname_prefix }}-hi"
-
-- name: Define service
-  set_fact:
-    test_service: |
-      version: '3'
-      services:
-        {{ cname }}:
-          image: "{{ docker_test_image_alpine }}"
-          command: '/bin/sh -c "sleep 10m"'
-          stop_grace_period: 1s
-
-- name: Present
-  community.docker.docker_compose:
-    project_name: "{{ pname }}"
-    state: present
-    remove_orphans: true
-    definition: "{{ test_service | from_yaml }}"
-
-- name: Absent
-  community.docker.docker_compose:
-    project_name: "{{ pname }}"
-    state: absent
-    remove_orphans: true
-    definition: "{{ test_service | from_yaml }}"