Fix developer install guide from horizon
Fix developer install guide from horizon

Change-Id: I07497fea33e095a5ddef02809a25a5ee0741e83a

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