update whetstone to use the updated docker app location
update whetstone to use the updated docker app location

Signed-off-by: Matthew McNew <be2bbfeb8f09c05321a39bd3422c5826e7dc06de@pivotal.io>

davidwadden/lattice-release,datachand/lattice,cloudfoundry-incubator/ltc,SrinivasChilveri/lattice,davidwadden/lattice,svrc-pivotal/lattice,davidwadden/lattice-release,Klaudit/lattice,SrinivasChilveri/lattice,datachand/lattice,svrc-pivotal/lattice,mikegehard/lattice,felipeg48/lattice,datachand/lattice,Klaudit/lattice,davidwadden/lattice,SrinivasChilveri/lattice,datachand/lattice,Klaudit/lattice,mikegehard/lattice,cloudfoundry-incubator/ltc,svrc-pivotal/lattice,SrinivasChilveri/lattice,svrc-pivotal/lattice,Klaudit/lattice,felipeg48/lattice