v3 api still use v2 ratelimit middleware

[Alex Xu]

[composite:openstack_compute_api_v3]
use = call:nova.api.auth:pipeline_factory
noauth = faultwrap sizelimit noauth_v3 ratelimit osapi_compute_app_v3
keystone = faultwrap sizelimit authtoken keystonecontext ratelimit osapi_compute_app_v3
keystone_nolimit = faultwrap sizelimit authtoken keystonecontext osapi_compute_app_v3

[filter:ratelimit]
paste.filter_factory = nova.api.openstack.compute.limits:RateLimitingMiddleware.factory

"nova.api.openstack.compute.limits:RateLimitingMiddleware.factory" is v2 ratelimit middleware

We should create common limit module, share same middleware code for v2 and v3

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/43606

[Alex Xu (xuhj)]

This already fixed by https://review.openstack.org/#/c/43607/