Fix quickstart guide
Fix quickstart guide

* Fixes command line arguments for image-register and image-add-tag commands in quickstart guide

Change-Id: Ifa4d05f140d22600694c6532494462724c08b0e9

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