use lightweight busybox image in test
use lightweight busybox image in test

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