bat: Remove BAT tests for overriding an existing image
bat: Remove BAT tests for overriding an existing image

We have made the architectural decision that in Ciao images should be
immutable. This change removes the BAT test that attempts to overwrite
both a non-existant image and an existinge image.

Fixes: #823

Signed-off-by: Rob Bradford <c49e1dc14cd52e2644816db47123896e0ac79025@intel.com>

rbradford/ciao,wcwxyz/ciao,mrkz/ciao,erick0z/ciao,tpepper/ciao,matthewrsj/ciao,ciao-project/ciao,markdryan/ciao,obedmr/ciao,mcastelino/ciao,01org/ciao,mcastelino/ciao,obedmr/ciao,rbradford/ciao,mcastelino/ciao,erick0z/ciao,wcwxyz/ciao,matthewrsj/ciao,mrkz/ciao,01org/ciao,kaccardi/ciao,markdryan/ciao,kaccardi/ciao,obedmr/ciao,ciao-project/ciao,mrkz/ciao,tpepper/ciao,wcwxyz/ciao,tpepper/ciao,matthewrsj/ciao,erick0z/ciao