Fix image detection in os_image openstack module (#63959)

Currently first check was by checksum only, and if there are 2
images with the same checksum, but different names, this check
fails with error:
* Multiple matches found for None *

To prevent this let's add more exact check in the beginning:
1. Firstly try to find by unique ID if it's given, most safe way.
2. Try to find by combination of name and checksum, not only
checksum, it will drop duplicates with different name.
3. Try to find just by name, as most general approach.

By going from most narrow to more general checks we can drop
duplicates in more efficient manner.

lib/ansible/modules/cloud/openstack/os_image.py

@@ -177,8 +177,10 @@ def main():
     try:
 
         changed = False
-        if module.params['checksum']:
-            image = cloud.get_image(name_or_id=None, filters={'checksum': module.params['checksum']})
+        if module.params['id']:
+            image = cloud.get_image(name_or_id=module.params['id'])
+        elif module.params['checksum']:
+            image = cloud.get_image(name_or_id=module.params['name'], filters={'checksum': module.params['checksum']})
         else:
             image = cloud.get_image(name_or_id=module.params['name'])