Do not document use_identity_api_v3 in the sample-basic file
Do not document use_identity_api_v3 in the sample-basic file

The value of the options has been switched to True, and Keystone
API V2 is deprected and it will be removed for Juno.

Change-Id: I5407d286a8db1ea1eac1ff90317a2ca2bc95ab2f

crobby/sahara,zhujzhuo/Sahara,tellesnobrega/storm_plugin,citrix-openstack-build/sahara,zhujzhuo/Sahara,mapr/sahara,keedio/sahara,tellesnobrega/sahara,matips/iosr-2015,esikachev/scenario,xme1226/sahara,crobby/sahara,zhangjunli177/sahara,zhangjunli177/sahara,ekasitk/sahara,matips/iosr-2015,matips/iosr-2015,esikachev/sahara-backup,zhujzhuo/Sahara,bigfootproject/sahara,esikachev/sahara-backup,henaras/sahara,egafford/sahara,tellesnobrega/sahara,redhat-openstack/sahara,xme1226/sahara,crobby/sahara,bigfootproject/sahara,citrix-openstack-build/sahara,zhangjunli177/sahara,esikachev/sahara-backup,mapr/sahara,mapr/sahara,keedio/sahara,xme1226/sahara,esikachev/scenario,henaras/sahara,tellesnobrega/storm_plugin,citrix-openstack-build/sahara,openstack/sahara,henaras/sahara,keedio/sahara,tellesnobrega/storm_plugin,bigfootproject/sahara,ekasitk/sahara,redhat-openstack/sahara,redhat-openstack/sahara,esikachev/scenario,egafford/sahara,openstack/sahara,ekasitk/sahara