Added bullet point for base_image_id in Item 4
Added bullet point for base_image_id in Item 4

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