docker_image, docker_image_facts, docker_volume: add basic integration tests (#47383)

* Add docker_image_facts tests.

* Add basic integration test for docker_volume.

* Add basic docker_image tests.

* Only start test registry when tests are actually run (i.e. not on CentOS 6).

test/integration/targets/docker_image_facts/aliases

@@ -0,0 +1,4 @@
+shippable/posix/group2
+skip/osx
+skip/freebsd
+destructive

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

@@ -0,0 +1,3 @@
+---
+dependencies:
+  - setup_docker

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

@@ -0,0 +1,52 @@
+---
+- block:
+  - name: Make sure image is not there
+    docker_image:
+      name: alpine:3.7
+      state: absent
+
+  - name: Inspect a non-available image
+    docker_image_facts:
+      name: alpine:3.7
+    register: result
+
+  - assert:
+      that:
+      - "result.images|length == 0"
+
+  - name: Make sure images are there
+    docker_image:
+      name: "{{ item }}"
+      pull: yes
+      state: present
+    loop:
+    - "hello-world:latest"
+    - "alpine:3.8"
+
+  - name: Inspect an available image
+    docker_image_facts:
+      name: hello-world:latest
+    register: result
+
+  - assert:
+      that:
+      - "result.images|length == 1"
+      - "'hello-world:latest' in result.images[0].RepoTags"
+
+  - name: Inspect multiple images
+    docker_image_facts:
+      name:
+      - "hello-world:latest"
+      - "alpine:3.8"
+    register: result
+
+  - debug: var=result
+
+  - assert:
+      that:
+      - "result.images|length == 2"
+      - "'hello-world:latest' in result.images[0].RepoTags"
+      - "'alpine:3.8' in result.images[1].RepoTags"
+
+  # Skip for CentOS 6
+  when: ansible_distribution != 'CentOS' or ansible_distribution_major_version|int > 6