ciao-controller: Delete ephemeral volumes if instance add fails
ciao-controller: Delete ephemeral volumes if instance add fails

If early instance creation fails or is denied by instance.Allowed() then
it is necessary to clean up any ephemeral volumes that have been
created.

Fixes: #1206

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

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