Backported changes to image_info from master branch

Added ci integration tests, updated return value documentation and
refactored to simplify code. Reverted changes such as function calls
and return values which would break backward compatibility with
previous collection releases.

Change-Id: Ibf934568f069c305747fc24fbb22ce3fc095286c
(cherry picked from commit c1a9794207)

ci/roles/image/tasks/main.yml

@@ -25,8 +25,8 @@
 - name: Verify image info
   assert:
     that:
-      - "image_info_result.openstack_image.name == image_name"
-      - "image_info_result.openstack_image.tags | sort == image_tags | sort"
+      - "image_info_result.openstack_images[0].name == image_name"
+      - "image_info_result.openstack_images[0].tags | sort == image_tags | sort"
 
 - name: Delete raw image (defaults)
   openstack.cloud.image:
@@ -71,4 +71,4 @@
 - name: Verify image is deleted
   assert:
     that:
-      - not deleted_image_info_result.openstack_image
+      - not deleted_image_info_result.openstack_images

ci/roles/image_info/defaults/main.yml

@@ -0,0 +1,23 @@
+expected_fields:
+  - checksum
+  - container_format
+  - created_at
+  - direct_url
+  - disk_format
+  - file
+  - id
+  - locations
+  - metadata
+  - min_disk
+  - min_ram
+  - name
+  - os_hidden
+  - owner
+  - properties
+  - schema
+  - size
+  - status
+  - tags
+  - updated_at
+  - virtual_size
+  - visibility

ci/roles/image_info/tasks/main.yml

@@ -0,0 +1,11 @@
+---
+- name: List all images  # This will list at least the default cirros image of devstack
+  openstack.cloud.image_info:
+    cloud: "{{ cloud }}"
+  register: image_list_result
+
+- name: Assert fields
+  assert:
+    that:
+      - item in image_list_result.openstack_images.0.keys()
+  loop: "{{ expected_fields }}"

ci/run-collection.yml

@@ -22,6 +22,7 @@
     - { role: identity_role, tags: identity_role }
     - { role: identity_role_info, tags: identity_role_info }
     - { role: image, tags: image }
+    - { role: image_info, tags: image_info }
     - { role: keypair, tags: keypair }
     - { role: keystone_domain, tags: keystone_domain }
     - role: keystone_mapping