api-ref: os-volumes.inc method verification
api-ref: os-volumes.inc method verification

Verified the API document with source for methods available
and response codes used.

Part of bp:api-ref-in-rst

Change-Id: Ic3c0dc56a905985a62d719c9d05db1cf4d1c1000

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