This repo does not support Python 2 anymore, so we don't need
six for compatibility between Python2 and 3, convert six usage to Python
3 code.
Change-Id: Icba56808f38277b27af2ae5aac4b8507dee71b3b
When do Flask refactor, some list APIs missed "hints"
for wrap_collection.
Add them back for list resource so that filters can work as
before
Change-Id: If32ca8d798c95436f72aa55ac7060e8eb7540de7
Partial-Bug: #1776504
Convert limits and registered limits to flask native dispatching.
NOTE: A minor test change was needed. The limit JSON Home data
was incorrectly formatted and did not properly isolate the
singular forms of "limit" and "registered_limit" from the
plural (list) APIs.
Change-Id: Ib3ceeb0a249ccc73c143730fac78d9f54c67174e
Partial-Bug: #1776504