Add docker_container_facts module. (#48062)

test/integration/targets/docker_container_facts/aliases

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+shippable/posix/group2
+skip/osx
+skip/freebsd
+destructive

test/integration/targets/docker_container_facts/meta/main.yml

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+---
+dependencies:
+  - setup_docker

test/integration/targets/docker_container_facts/tasks/main.yml

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+---
+- block:
+  - name: Create random container name
+    set_fact:
+      cname: "{{ 'ansible-test-%0x' % ((2**32) | random) }}"
+
+  - name: Make sure container is not there
+    docker_container:
+      name: "{{ cname }}"
+      state: absent
+      stop_timeout: 1
+
+  - name: Inspect a non-present container
+    docker_container_facts:
+      name: "{{ cname }}"
+    register: result
+
+  - assert:
+      that:
+      - "not result.exists"
+      - "'docker_container' in result"
+      - "not result.docker_container"
+
+  - name: Make sure container exists
+    docker_container:
+      name: "{{ cname }}"
+      image: alpine:3.8
+      command: '/bin/sh -c "sleep 10m"'
+      state: started
+      auto_remove: yes
+      stop_timeout: 1
+
+  - name: Inspect a present container
+    docker_container_facts:
+      name: "{{ cname }}"
+    register: result
+  - name: Dump docker_container_facts result
+    debug: var=result
+
+  - name: "Comparison: use 'docker inspect'"
+    command: docker inspect "{{ cname }}"
+    register: docker_inspect
+  - set_fact:
+      docker_inspect_result: "{{ docker_inspect.stdout | from_json }}"
+  - name: Dump docker inspect result
+    debug: var=docker_inspect_result
+
+  - name: Cleanup
+    docker_container:
+      name: "{{ cname }}"
+      state: absent
+      stop_timeout: 1
+
+  - assert:
+      that:
+      - result.exists
+      - "'docker_container' in result"
+      - "result.docker_container"
+      - "result.docker_container == docker_inspect_result[0]"
+
+  # Skip for CentOS 6
+  when: ansible_distribution != 'CentOS' or ansible_distribution_major_version|int > 6