Add stack_info module

We lost stack_info module during transition from github. Implement it
using newer interface and add tests. Change depends on SDK change adding
missing query filters.

Depends-On: https://review.opendev.org/c/openstack/openstacksdk/+/769484
Change-Id: Ie7e6d04ea298ba068f547a53643806b6bc84f873

plugins/modules/stack_info.py

@@ -0,0 +1,109 @@
+#!/usr/bin/python
+# coding: utf-8 -*-
+
+# Copyright (c) 2020, Sagi Shnaidman <sshnaidm@redhat.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+DOCUMENTATION = '''
+---
+module: stack_info
+short_description: Retrive information about Heat stacks
+author: OpenStack Ansible SIG
+description:
+  - Get information about Heat stack in openstack
+options:
+  name:
+    description:
+    - Name of the stack as a string.
+    type: str
+    required: false
+  status:
+    description:
+    - Value of the status of the stack so that you can filter on "available" for example
+    type: str
+    required: false
+  project_id:
+    description:
+      - Project ID to be used as filter
+    type: str
+    required: false
+  owner_id:
+    description:
+      - Owner (parent) of the stack to be used as a filter
+    type: str
+    required: false
+
+requirements:
+  - "python >= 3.6"
+  - "openstacksdk"
+
+extends_documentation_fragment:
+  - openstack.cloud.openstack
+'''
+
+RETURN = '''
+stacks:
+    description: List of dictionaries describing stacks.
+    type: list
+    elements: dict
+    returned: always.
+    contains:
+        id:
+            description: Unique UUID.
+            type: str
+            sample: "39007a7e-ee4f-4d13-8283-b4da2e037c69"
+        status:
+            description: Stack status.
+            type: str
+
+'''
+
+EXAMPLES = '''
+# Get backups.
+- openstack.cloud.stack_info:
+  register: stack
+
+- openstack.cloud.stack_info:
+    name: my_stack
+  register: stack
+'''
+
+from ansible_collections.openstack.cloud.plugins.module_utils.openstack import OpenStackModule
+
+
+class StackInfoModule(OpenStackModule):
+    module_min_sdk_version = '0.53.0'
+
+    argument_spec = dict(
+        name=dict(required=False, type='str'),
+        status=dict(required=False, type='str'),
+        project_id=dict(required=False, type='str'),
+        owner_id=dict(required=False, type='str')
+    )
+
+    def run(self):
+        data = []
+        attrs = {}
+
+        for param in ['name', 'status', 'project_id', 'owner_id']:
+            if self.params[param]:
+                attrs[param] = self.params[param]
+
+        for raw in self.conn.orchestration.stacks(**attrs):
+            dt = raw.to_dict()
+            dt.pop('location')
+            data.append(dt)
+
+        self.exit_json(
+            changed=False,
+            stacks=data
+        )
+
+
+def main():
+    module = StackInfoModule()
+    module()
+
+
+if __name__ == '__main__':
+    main()