Docker inventory plugin (#61)

* Began with docker inventory plugin.

* Linting.

* Improve plugin, add basic unit tests.

* Linting.

* Add integration test.

* Adjust tests to case that there are more containers.

* There can be stopped containers.

ci_coverage

* docker -> docker_containers

tests/integration/targets/inventory_docker_containers/runme.sh

@@ -0,0 +1,22 @@
+#!/usr/bin/env bash
+
+[[ -n "$DEBUG" || -n "$ANSIBLE_DEBUG" ]] && set -x
+
+set -euo pipefail
+
+cleanup() {
+    echo "Cleanup"
+    ansible-playbook playbooks/docker_cleanup.yml
+    echo "Done"
+}
+
+trap cleanup INT TERM EXIT
+
+echo "Setup"
+ANSIBLE_ROLES_PATH=.. ansible-playbook  playbooks/docker_setup.yml
+
+echo "Test docker_containers inventory 1"
+ansible-playbook -i inventory_1.docker.yml playbooks/test_inventory_1.yml
+
+echo "Test docker_containers inventory 2"
+ansible-playbook -i inventory_2.docker.yml playbooks/test_inventory_2.yml