docker_container, docker_image_facts: allow to use image IDs (#46324)

* Allow to specify images by hash for docker_container and docker_image_facts.

* flake8

* More sanity checks.

* Added changelog.

* Added test.

* Make compatible with Python < 3.4.

* Remove out-commented imports.

test/integration/targets/docker_container/tasks/tests/image-ids.yml

@@ -0,0 +1,71 @@
+---
+- name: Registering container name
+  set_fact:
+    cname: "{{ cname_prefix ~ '-iid' }}"
+- name: Registering container name
+  set_fact:
+    cnames: "{{ cnames }} + [cname]"
+
+- name: Pull images
+  docker_image:
+    name: "{{ item }}"
+    pull: true
+  loop:
+    - "hello-world:latest"
+    - "alpine:3.8"
+
+- name: Get image ID of hello-world and alpine images
+  docker_image_facts:
+    name:
+    - "hello-world:latest"
+    - "alpine:3.8"
+  register: image_facts
+
+- assert:
+    that:
+      - image_facts.images | length == 2
+
+- name: Print image IDs
+  debug:
+    msg: "hello-world: {{ image_facts.images[0].Id }}; alpine: {{ image_facts.images[1].Id }}"
+
+- name: Create container with hello-world image via ID
+  docker_container:
+    image: "{{ image_facts.images[0].Id }}"
+    name: "{{ cname }}"
+    state: present
+  register: create_1
+
+- name: Create container with hello-world image via ID (idempotent)
+  docker_container:
+    image: "{{ image_facts.images[0].Id }}"
+    name: "{{ cname }}"
+    state: present
+  register: create_2
+
+- name: Create container with alpine image via ID
+  docker_container:
+    image: "{{ image_facts.images[1].Id }}"
+    name: "{{ cname }}"
+    state: present
+  register: create_3
+
+- name: Create container with alpine image via ID (idempotent)
+  docker_container:
+    image: "{{ image_facts.images[1].Id }}"
+    name: "{{ cname }}"
+    state: present
+  register: create_4
+
+- name: Cleanup
+  docker_container:
+    name: "{{ cname }}"
+    state: absent
+    stop_timeout: 1
+
+- assert:
+    that:
+      - create_1 is changed
+      - create_2 is not changed
+      - create_3 is changed
+      - create_4 is not changed

test/sanity/code-smell/no-underscore-variable.py

@@ -33,7 +33,6 @@ def main():
         'lib/ansible/modules/cloud/amazon/route53_zone.py',
         'lib/ansible/modules/cloud/amazon/s3_sync.py',
         'lib/ansible/modules/cloud/azure/azure_rm_loadbalancer.py',
-        'lib/ansible/modules/cloud/docker/docker_container.py',
         'lib/ansible/modules/cloud/docker/docker_service.py',
         'lib/ansible/modules/cloud/google/gce.py',
         'lib/ansible/modules/cloud/google/gce_eip.py',