Merge pull request #697 from Random-Liu/fs-layout-change

adds volatile state directory to the fs plan for cntrs/pods/fifo

docs/config.md

@@ -67,4 +67,4 @@ The explanation and default value of each configuration item are as follows:
     [plugins.cri.registry.mirrors]
       [plugins.cri.registry.mirrors."docker.io"]
         endpoint = ["https://registry-1.docker.io", ]
-```
+```

docs/crictl.md

@@ -189,7 +189,8 @@ $ crictl info
     "statsCollectPeriod": 10,
     "containerdRootDir": "/var/lib/containerd",
     "containerdEndpoint": "/run/containerd/containerd.sock",
-    "rootDir": "/var/lib/containerd/io.containerd.grpc.v1.cri"
+    "rootDir": "/var/lib/containerd/io.containerd.grpc.v1.cri",
+    "stateDir": "/run/containerd/io.containerd.grpc.v1.cri",
   },
   "golang": "go1.10"
 }