update redis image in getting started doc
update redis image in getting started doc

lukemarsden/flocker,achanda/flocker,moypray/flocker,agonzalezro/flocker,w4ngyi/flocker,w4ngyi/flocker,AndyHuu/flocker,Azulinho/flocker,1d4Nf6/flocker,jml/flocker,adamtheturtle/flocker,mbrukman/flocker,lukemarsden/flocker,AndyHuu/flocker,lukemarsden/flocker,jml/flocker,runcom/flocker,runcom/flocker,runcom/flocker,AndyHuu/flocker,w4ngyi/flocker,mbrukman/flocker,agonzalezro/flocker,Azulinho/flocker,achanda/flocker,agonzalezro/flocker,1d4Nf6/flocker,wallnerryan/flocker-profiles,adamtheturtle/flocker,1d4Nf6/flocker,wallnerryan/flocker-profiles,adamtheturtle/flocker,moypray/flocker,achanda/flocker,hackday-profilers/flocker,moypray/flocker,hackday-profilers/flocker,wallnerryan/flocker-profiles,Azulinho/flocker,LaynePeng/flocker,jml/flocker,hackday-profilers/flocker,mbrukman/flocker,LaynePeng/flocker,LaynePeng/flocker