docker_host_info: allow to list all containers (#538)

* Allow to list all containers.

* Fix typo.

tests/integration/targets/docker_host_info/tasks/test_host_info.yml

@@ -6,10 +6,11 @@
 - name: Create random container/volume name
   set_fact:
     cname: "{{ 'ansible-docker-test-%0x' % ((2**32) | random) }}"
+    cname2: "{{ 'ansible-docker-test-%0x' % ((2**32) | random) }}"
     vname: "{{ 'ansible-docker-test-%0x' % ((2**32) | random) }}"
 
 - debug:
-    msg: "Using container name '{{ cname }}' and volume name '{{ vname }}'"
+    msg: "Using container names '{{ cname }}' and '{{ cname2 }}', and volume name '{{ vname }}'"
 
 - block:
   - name: Get info on Docker host
@@ -30,7 +31,7 @@
 # * container and volume lists are non-emtpy because of the created objects;
 # * image list is non-empty because the image of the container is there;
 # * network list is always non-empty (default networks).
-  - name: Create container
+  - name: Create running container
     docker_container:
       image: "{{ docker_test_image_alpine }}"
       command: '/bin/sh -c "sleep 10m"'
@@ -41,9 +42,20 @@
       state: started
     register: container_output
 
+  - name: Create running container
+    docker_container:
+      image: "{{ docker_test_image_alpine }}"
+      name: "{{ cname2 }}"
+      labels:
+        key2: value2
+        key3: value3
+      state: stopped
+    register: container2_output
+
   - assert:
       that:
       - container_output is changed
+      - container2_output is changed
 
   - name: Create a volume
     docker_volume:
@@ -108,6 +120,28 @@
     assert:
       that: "{{ output.containers | length }} == 0"
 
+  - name: Get info on Docker host and list containers matching filters (single label, not all containers)
+    docker_host_info:
+      containers: true
+      containers_all: false
+      containers_filters:
+        label: key2=value2
+    register: output
+
+  - name: Get info on Docker host and list containers matching filters (single label, all containers)
+    docker_host_info:
+      containers: true
+      containers_all: true
+      containers_filters:
+        label: key2=value2
+    register: output_all
+
+  - name: assert one resp. two container is returned
+    assert:
+      that:
+        - "{{ output.containers | length }} == 1"
+        - "{{ output_all.containers | length }} == 2"
+
   - name: Get info on Docker host and list containers with verbose output
     docker_host_info:
       containers: yes