Add reviewing point related to REST API
Add reviewing point related to REST API

During nova-specs/nova reviews, it is difficult to check all API changes
for following api-wg guideline because there is a lot of nova-specs/nova
patches. There are some common mistakes against following guideline,
then this patch adds a part of the guideline to the code-review guideline
for avoiding these mistakes.

Change-Id: I2192e9ffd3026057dc01006bd0ba419140c5b5b0

gooddata/openstack-nova,klmitch/nova,mikalstill/nova,vmturbo/nova,bigswitch/nova,cyx1231st/nova,sebrandon1/nova,gooddata/openstack-nova,cernops/nova,hanlind/nova,alaski/nova,klmitch/nova,sebrandon1/nova,jianghuaw/nova,apporc/nova,vmturbo/nova,openstack/nova,rajalokan/nova,mahak/nova,openstack/nova,BeyondTheClouds/nova,cloudbase/nova,cloudbase/nova,cernops/nova,hanlind/nova,NeCTAR-RC/nova,sebrandon1/nova,gooddata/openstack-nova,rahulunair/nova,mikalstill/nova,BeyondTheClouds/nova,alaski/nova,rahulunair/nova,NeCTAR-RC/nova,dims/nova,cloudbase/nova,zhimin711/nova,cernops/nova,bigswitch/nova,CEG-FYP-OpenStack/scheduler,hanlind/nova,dims/nova,apporc/nova,jianghuaw/nova,mikalstill/nova,Juniper/nova,phenoxim/nova,mahak/nova,jianghuaw/nova,zhimin711/nova,Juniper/nova,klmitch/nova,Juniper/nova,rajalokan/nova,gooddata/openstack-nova,openstack/nova,vmturbo/nova,Juniper/nova,mahak/nova,rajalokan/nova,cyx1231st/nova,CEG-FYP-OpenStack/scheduler,rajalokan/nova,BeyondTheClouds/nova,vmturbo/nova,rahulunair/nova,jianghuaw/nova,phenoxim/nova,klmitch/nova