subtests.docker_cli: Add run_attach test

This test checks different ``docker run -a xxx`` variants. (Implements https://github.com/autotest/autotest-docker/issues/216 )

I still haven't created bugzillas for all problems so the expected results might change in the future. Also I bumped to another `docker` bug, which hides the output so couple of tests fails because of that:

https://bugzilla.redhat.com/show_bug.cgi?id=1131592

There is a possible workaround (use InteractiveAsyncDockerCmd + custom PIPE), but I'd like to first try convincing the guys to fix it rather than spam autotest-docker with workarounds. Anyway if they say it's not gonna be fixed soon we'd have to use it.

Kind regards,
Lukáš