address multiple issues found by pylint (#206)

src/api-service/__app__/onefuzzlib/azure/queue.py

@@ -94,7 +94,7 @@ def clear_queue(name: QueueNameType, *, account_id: str) -> None:
         try:
             queue.clear_messages()
         except ResourceNotFoundError:
-            return None
+            pass
 
 
 def send_message(

src/api-service/__app__/onefuzzlib/azure/subnet.py

@@ -39,8 +39,7 @@ def delete_subnet(resource_group: str, name: str) -> Union[None, CloudError, Any
                 "subnet delete failed: %s %s : %s", resource_group, name, repr(err)
             )
             return None
-        else:
-            raise err
+        raise err
 
 
 def create_virtual_network(

src/api-service/__app__/onefuzzlib/azure/vm.py

@@ -119,7 +119,7 @@ def get_extension(vm_name: str, extension_name: str) -> Optional[Any]:
     resource_group = get_base_resource_group()
 
     logging.debug(
-        "getting extension: %s:%s:%s - %s",
+        "getting extension: %s:%s:%s",
         resource_group,
         vm_name,
         extension_name,