Description of problem:

The logdriver used by docker.service ("journald") doesn't allow reading of logs via "docker logs".

Version-Release number of selected component (if applicable):

docker-1.8.2-10.git28c300f.fc23.x86_64

How reproducible:

Always

Steps to Reproduce:
1. virt-builder fedora-23
2. # dnf install docker
3. # systemctl start docker
4. # docker run --name bugger busybox /bin/echo hi
5. # docker logs bugger

Actual results:

logs" command is supported only for "json-file" logging driver (got: journald)

Expected results:

hi