vultr.py: query_resource_by_key Handle list and dict (#43301)

The Vultr API is inconsistent in the type of the value it returns
based on the resources. While most of the time it will be a dict, for
some resources it will be a list (/v1/user/list, /v1/block/list).

query_resource_by_key() fails if the return value isn't a dict (.items()
does not exist on list). This patch aims to support both list and dict.

lib/ansible/module_utils/vultr.py

@@ -219,7 +219,14 @@ class Vultr:
 
         if not r_list:
             return {}
-
+        elif isinstance(r_list, list):
+            for r_data in r_list:
+                if str(r_data[key]) == str(value):
+                    self.api_cache.update({
+                        resource: r_data
+                    })
+                    return r_data
+        elif isinstance(r_list, dict):
             for r_id, r_data in r_list.items():
                 if str(r_data[key]) == str(value):
                     self.api_cache.update({