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_volume/aliases

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

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

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+---
+dependencies:
+  - setup_docker

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

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+---
+- name: Create random name prefix
+  set_fact:
+    name_prefix: "{{ 'ansible-test-%0x' % ((2**32) | random) }}"
+    vnames: []
+
+- debug:
+    msg: "Using name prefix {{ name_prefix }}"
+
+- block:
+  - include_tasks: run-test.yml
+    with_fileglob:
+    - "tests/*.yml"
+
+  always:
+  - name: "Make sure all volumes are removed"
+    docker_volume:
+      name: "{{ item }}"
+      state: absent
+      force: yes
+    with_items: "{{ vnames }}"
+
+  # Skip for CentOS 6
+  when: ansible_distribution != 'CentOS' or ansible_distribution_major_version|int > 6

test/integration/targets/docker_volume/tasks/run-test.yml

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+---
+- name: "Loading tasks from {{ item }}"
+  include_tasks: "{{ item }}"

test/integration/targets/docker_volume/tasks/tests/basic.yml

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+---
+- name: Registering volume name
+  set_fact:
+    vname: "{{ name_prefix ~ '-basic' }}"
+- name: Registering container name
+  set_fact:
+    vnames: "{{ vnames }} + [vname]"
+
+####################################################################
+## basic ###########################################################
+####################################################################
+
+- name: Create a volume
+  docker_volume:
+    name: "{{ vname }}"
+  register: create_1
+
+- name: Create a volume (idempotency)
+  docker_volume:
+    name: "{{ vname }}"
+  register: create_2
+
+- name: Create a volume (force)
+  docker_volume:
+    name: "{{ vname }}"
+    force: yes
+  register: create_3
+
+- name: Remove a volume
+  docker_volume:
+    name: "{{ vname }}"
+    state: absent
+  register: absent_1
+
+- name: Remove a volume (idempotency)
+  docker_volume:
+    name: "{{ vname }}"
+    state: absent
+  register: absent_2
+
+- assert:
+    that:
+    - create_1 is changed
+    - create_2 is not changed
+    - create_3 is changed
+    - absent_1 is changed
+    - absent_2 is not changed
+
+####################################################################
+## driver_options ##################################################
+####################################################################
+
+- name: Create a volume with options
+  docker_volume:
+    name: "{{ vname }}"
+    driver: local
+    driver_options:
+      type: tempfs
+      device: tmpfs
+      o: size=100m,uid=1000
+  register: driver_options_1
+
+- name: Create a volume with options (idempotency)
+  docker_volume:
+    name: "{{ vname }}"
+    driver: local
+    driver_options:
+      type: tempfs
+      device: tmpfs
+      o: size=100m,uid=1000
+  register: driver_options_2
+
+- name: Create a volume with options (changed)
+  docker_volume:
+    name: "{{ vname }}"
+    driver: local
+    driver_options:
+      type: tempfs
+      device: tmpfs
+      o: size=200m,uid=1000
+  register: driver_options_3
+
+- name: Cleanup
+  docker_volume:
+    name: "{{ vname }}"
+    state: absent
+
+- assert:
+    that:
+    - driver_options_1 is changed
+    - driver_options_2 is not changed
+    - driver_options_3 is changed