API: Rearrange HTTPBadRequest raising in _resize
API: Rearrange HTTPBadRequest raising in _resize

This patch aimed to fix AutoDiskConfigDisabledByImage exception is
excpeced for 2 times, besides, rearrange HTTPBadRequest to group them
around each other for easy reading.

P.S. Don't touch any logic so no UT need to be added/changed.

Closes-Bug: #1538411
Change-Id: I2088322681edd4a3190047560ea99d31c5f3a551

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