Set log_size_max for podman

We run kube*, etcd and heat-container-agent with
podman. We need to move from libpod.conf to
containers.conf

Keep the limit to 50M.

OS-14733

Change-Id: Id0a6a2b453f2ad28696783a41c184d6d526d8a66
Signed-off-by: Spyros Trigazis <spyridon.trigazis@cern.ch>

magnum/drivers/k8s_fedora_coreos_v1/templates/user_data.json

@@ -44,6 +44,19 @@
           "mode": 420,
           "contents": { "source": "data:,$HOSTNAME" }
         },
+        {
+          "group": {
+            "name": "root"
+          },
+          "path": "/etc/containers/containers.conf",
+          "user": {
+            "name": "root"
+          },
+          "contents": {
+            "source": "data:,%23%20Maximum%20size%20of%20log%20files%20(in%20bytes)%0A%23%20-1%20is%20unlimited%0A%23%2050m%0A%5Bcontainers%5D%0Alog_size_max%20%3D%2052428800%0A"
+          },
+          "mode": 420
+        },
         {
           "group": {
             "name": "root"