docker_swarm inventory plugin: add basic integration tests (#53908)

* Add basic docker_swarm inventory plugin integration tests.

* Call dependency explicitly.

test/integration/targets/inventory_docker_swarm/aliases

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+shippable/posix/group2
+skip/osx
+skip/freebsd
+destructive
+skip/docker  # The tests sometimes make docker daemon unstable; hence,
+             # we skip all docker-based CI runs to avoid disrupting
+             # the whole CI system. On VMs, we restart docker daemon
+             # after finishing the tests to minimize potential effects
+             # on other tests.
+needs/root

test/integration/targets/inventory_docker_swarm/inventory_1.docker_swarm.yml

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+---
+plugin: docker_swarm
+host: unix://var/run/docker.sock

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

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+---
+dependencies:
+  - setup_docker

test/integration/targets/inventory_docker_swarm/playbooks/swarm_cleanup.yml

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+---
+- hosts: 127.0.0.1
+  connection: local
+  gather_facts: no
+  tasks:
+    - name: Make sure swarm is removed
+      docker_swarm:
+        state: absent
+        force: yes

test/integration/targets/inventory_docker_swarm/playbooks/swarm_setup.yml

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+---
+- hosts: 127.0.0.1
+  connection: local
+  tasks:
+    - name: Setup docker
+      include_role:
+        name: ../../setup_docker
+    - name: Create a Swarm cluster
+      docker_swarm:
+        state: present
+        advertise_addr: "{{ansible_default_ipv4.address | default('127.0.0.1')}}"

test/integration/targets/inventory_docker_swarm/playbooks/test_inventory_1.yml

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+---
+- hosts: all
+  connection: local  # otherwise Ansible will complain that it cannot connect via ssh to 127.0.0.1:22
+  tasks:
+    - name: Check for groups
+      assert:
+        that:
+          - "groups.manager | length > 0"
+          - "groups.worker | length >= 0"
+          - "groups.leader | length == 1"
+      run_once: yes
+
+    - name: List manager group
+      debug:
+        var: groups.manager
+      run_once: yes
+
+    - name: List worker group
+      debug:
+        var: groups.worker
+      run_once: yes
+
+    - name: List leader group
+      debug:
+        var: groups.leader
+      run_once: yes
+
+    - name: Print ansible_host per host
+      debug:
+        var: ansible_host
+
+    - name: Print docker_swarm_node_attributes per host
+      debug:
+        var: docker_swarm_node_attributes

test/integration/targets/inventory_docker_swarm/runme.sh

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+#!/usr/bin/env bash
+
+[[ -n "$DEBUG" || -n "$ANSIBLE_DEBUG" ]] && set -x
+
+set -euo pipefail
+
+cleanup() {
+    echo "Cleanup"
+    ansible-playbook playbooks/swarm_cleanup.yml
+    echo "Done"
+    exit 0
+}
+
+trap cleanup INT TERM EXIT
+
+echo "Setup"
+ansible-playbook playbooks/swarm_setup.yml
+
+echo "Test docker_swarm inventory 1"
+ansible-playbook -i inventory_1.docker_swarm.yml playbooks/test_inventory_1.yml