Remove unused args from RateLimitingMiddleware
Remove unused args from RateLimitingMiddleware

There are arguments limits and limiter in __init__() of
RateLimitingMiddleware, but they are not used now.
So this patch removes them for the code cleanup.

Change-Id: Ic0bcc8daf79988802d8a615c113b01e8d183b9c4

Juniper/nova,gooddata/openstack-nova,sebrandon1/nova,mahak/nova,rajalokan/nova,rajalokan/nova,bigswitch/nova,jianghuaw/nova,rajalokan/nova,sebrandon1/nova,jianghuaw/nova,bigswitch/nova,hanlind/nova,alaski/nova,hanlind/nova,cloudbase/nova,gooddata/openstack-nova,vmturbo/nova,rahulunair/nova,phenoxim/nova,cloudbase/nova,phenoxim/nova,sebrandon1/nova,openstack/nova,jianghuaw/nova,klmitch/nova,klmitch/nova,alaski/nova,mahak/nova,klmitch/nova,klmitch/nova,gooddata/openstack-nova,rahulunair/nova,vmturbo/nova,openstack/nova,vmturbo/nova,Juniper/nova,openstack/nova,mikalstill/nova,hanlind/nova,mikalstill/nova,mahak/nova,rajalokan/nova,Juniper/nova,gooddata/openstack-nova,jianghuaw/nova,mikalstill/nova,Juniper/nova,rahulunair/nova,cloudbase/nova,vmturbo/nova