subtests: Fix minor problems in tests.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
docker_daemon: Adds docs for network and tls tests.

Signed-off-by: Jiří Župka <jzupka@redhat.com>
Merge pull request #302 from jzupka/fix_problems

subtests: Fix minor problems in tests.
Merge pull request #304 from jzupka/daemon_net_tls_docs

docker_daemon: Adds docs for network and tls tests.