Disable aufs module which is no longer used by Docker

AUFSUmountHung kernel error slows down the node and caused timeout for other processes. Docker now prefers overlay2 to aufs and containerd prefers overlay so it is safe to disable AUFS.

Replicate of kubernetes#103831

Change-Id: I1b5dc48c50cb0553308e21f3c92e00386f814132
Bug: 193674321

gke/cluster/gce/gci/configure-helper.sh

@@ -1516,6 +1516,13 @@ EOF
 	fi
 }
 
+function disable_aufs() {
+  # disable aufs module if aufs is loaded
+  if lsmod | grep "aufs" &> /dev/null ; then
+    sudo modprobe -r aufs
+  fi
+}
+
 function set_docker_options_non_ubuntu() {
   # set docker options mtu and storage driver for non-ubuntu
   # as it is default for ubuntu
@@ -1575,6 +1582,7 @@ addockeropt "\"pidfile\": \"/var/run/docker.pid\",
       docker_opts+="--registry-mirror=${DOCKER_REGISTRY_MIRROR_URL} "
   fi
 
+  disable_aufs
   set_docker_options_non_ubuntu
 
   echo "setting docker logging options"