use simplified image variable name
use simplified image variable name

stevekuznetsov/sti-base,btison/sti-base,openshift/sti-base,bparees/sti-base,mfojtik/sti-base,sclorg/s2i-base-container,mnagy/openshift-base,mdshuai/sti-base,humaton/sti-base,soltysh/sti-base,openshift/sti-base,hhorak/sti-base,mfojtik/sti-base,bparees/sti-base