compose/minio: add aliases
compose/minio: add aliases

when used in conjuction with the demo layer, this layer will
overwrite aliases, e.g. s3.docker.mender.io will be unavailable.
this depends on the order of the included files, but is an issue
with backend tests (order is more or less fixed).

changelog: none

Signed-off-by: mchalczynski <3a897b56ed6fc284ae11e3e7ec3ea48d098a7178@rndity.com>

pasinskim/integration,pasinskim/integration,pasinskim/integration