cri-o: Ensure overlay is available

Some distro releases may not have overlay loaded into the kernel. This
change looks for overlay via lsmod and, if it isn't already there,
uses modprobe to load it in and then drops a load config into
/etc/modules-load.d/overlay.conf.

roles/docker/tasks/systemcontainer_crio.yml

@@ -25,6 +25,26 @@
     state: present
   when: not openshift.common.is_atomic | bool
 
+
+- name: Check that overlay is in the kernel
+  shell: lsmod | grep overlay
+  register: l_has_overlay_in_kernel
+  ignore_errors: yes
+
+
+- when: l_has_overlay_in_kernel.rc != 0
+  block:
+
+    - name: Add overlay to modprobe.d
+      template:
+        dest: /etc/modules-load.d/overlay.conf
+        src: overlay.conf.j2
+        backup: yes
+
+    - name: Manually modprobe overlay into the kernel
+      command: modprobe overlay
+
+
 - block:
 
     - name: Add http_proxy to /etc/atomic.conf

roles/docker/templates/overlay.conf.j2

@@ -0,0 +1,2 @@
+### {{ ansible_managed }}
+overlay