Fix printing docker container logs

Currently, we observe non-readable artefacts in the beginning of each
log line from docker container because log stream prints logs in
multiplexed way and first 8 bytes is actually a header by default. This
patch fixes this issue by using TTY mode (in this case output data
is copied directly from the container output stream, no extra
multiplexing or headers)[1].

[1] https://godoc.org/github.com/docker/docker/client#Client.ContainerLogs

Change-Id: I26f1588936be736a124b9c77ed712ac4376f03a2
Signed-off-by: Ruslan Aliev <raliev@mirantis.com>

pkg/container/container_docker.go

@@ -175,6 +175,7 @@ func (c *DockerContainer) getConfig(
 		AttachStdin: true,
 		OpenStdin:   true,
 		Env:         envVars,
+		Tty:         true,
 	}
 	hCfg := container.HostConfig{
 		Binds: volumeMounts,