Redirecting docker daemon stdout/stderr to /var/log/dockerd

puppet/modules/docker/templates/dockerd.conf

@@ -8,5 +8,5 @@ respawn
 
 script
     test -f /etc/default/locale && . /etc/default/locale || true
-    LANG=$LANG LC_ALL=$LANG /usr/local/bin/docker -d
+    LANG=$LANG LC_ALL=$LANG /usr/local/bin/docker -d >> /var/log/dockerd 2>&1
 end script