CI: Fix get_logs.sh docker logs output

Currently the logs get printed in Zuul job stdout and only a small portion
of them is redirected to a file - this patch changes that to send all output
to desired files.

Change-Id: I45e937ec7c102e89edee20679b8959bf7f6c7152

roles/kayobe-diagnostics/files/get_logs.sh

@@ -72,7 +72,7 @@ copy_logs() {
     (docker info && docker images && docker ps -a) > ${LOG_DIR}/system_logs/docker-info.txt
 
     for container in $(docker ps -a --format "{{.Names}}"); do
-        docker logs --tail all ${container} > ${LOG_DIR}/docker_logs/${container}.txt
+        docker logs --tail all ${container} &> ${LOG_DIR}/docker_logs/${container}.txt
     done
 
     # Bifrost: grab config files and logs from the container.