[Vanilla] Updated docs to point to icehouse images
[Vanilla] Updated docs to point to icehouse images

Also updated limitation to be up to date.

Closes-Bug: #1270277

Change-Id: I3875622ae515c4a29c4f5b05357c06d0901d14da

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