[LTP] [PATCH] travis: Use official opensuse images

[Cyril Hrubis]

Hi!
> We're using deprecated opensuse images [1] [2] which has been now
> removed, which cause travis failures. Replace them with the official
> ones.
> 
> [1] https://hub.docker.com/_/opensuse/
> [2] https://github.com/docker-library/official-images/issues/5371

That looks obvious enough to go in without review, acked anyways.

-- 
Cyril Hrubis
chrubis@suse.cz