Set docker log driver to json-file on Fedora CoreOS

* Fix the last minor issue for Fedora CoreOS clusters to pass CNCF's
Kubernetes conformance tests
* Kubelet supports a seldom used feature `kubectl logs --limit-bytes=N`
to trim a log stream to a desired length. Kubelet handles this in the
CRI driver. The Kubelet docker shim only supports the limit bytes
feature when Docker is configured with the default `json-file` logging
driver
* CNCF conformance tests started requiring limit-bytes be supported,
indirectly forcing the log driver choice until either the Kubelet or
the conformance tests are fixed
* Fedora CoreOS defaults Docker to use `journald` (desired). For now,
as a workaround to offer conformant clusters, the log driver can
be set back to `json-file`. RHEL CoreOS likely won't have noticed the
non-conformance since its using crio runtime
* https://github.com/kubernetes/kubernetes/issues/86367

Note: When upstream has a fix, the aim is to drop the docker config
override and use the journald default

bare-metal/fedora-coreos/kubernetes/fcc/controller.yaml

@@ -193,6 +193,19 @@ storage:
           DefaultCPUAccounting=yes
           DefaultMemoryAccounting=yes
           DefaultBlockIOAccounting=yes
+    - path: /etc/sysconfig/docker
+      mode: 0644
+      overwrite: true
+      contents:
+        inline: |
+          # Modify these options if you want to change the way the docker daemon runs
+          OPTIONS="--selinux-enabled \
+            --log-driver=json-file \
+            --live-restore \
+            --default-ulimit nofile=1024:1024 \
+            --init-path /usr/libexec/docker/docker-init \
+            --userland-proxy-path /usr/libexec/docker/docker-proxy \
+          "
     - path: /etc/etcd/etcd.env
       mode: 0644
       contents:

bare-metal/fedora-coreos/kubernetes/fcc/worker.yaml

@@ -106,6 +106,19 @@ storage:
           DefaultCPUAccounting=yes
           DefaultMemoryAccounting=yes
           DefaultBlockIOAccounting=yes
+    - path: /etc/sysconfig/docker
+      mode: 0644
+      overwrite: true
+      contents:
+        inline: |
+          # Modify these options if you want to change the way the docker daemon runs
+          OPTIONS="--selinux-enabled \
+            --log-driver=json-file \
+            --live-restore \
+            --default-ulimit nofile=1024:1024 \
+            --init-path /usr/libexec/docker/docker-init \
+            --userland-proxy-path /usr/libexec/docker/docker-proxy \
+          "
 passwd:
   users:
     - name: core