IMGAPI-328: DeleteImage should be idempotent for 'destroyed' images
IMGAPI-328: DeleteImage should be idempotent for 'destroyed' images
numericillustration/sdc-imgapi,joyent/sdc-imgapi,joyent/sdc-imgapi,joyent/sdc-imgapi,numericillustration/sdc-imgapi,numericillustration/sdc-imgapi