Resurrect State directory

Signed-off-by: Kenfe-Mickael Laventure <mickael.laventure@gmail.com>

server/server_linux.go

@@ -9,6 +9,12 @@ import (
 )
 
 const (
+	// DefaultRootDir is the default location used by containerd to store
+	// persistent data
+	DefaultRootDir = "/var/lib/containerd"
+	// DefaultStateDir is the default location used by containerd to store
+	// transient data
+	DefaultStateDir = "/run/containerd"
 	// DefaultAddress is the default unix socket address
 	DefaultAddress = "/run/containerd/containerd.sock"
 	// DefaultDebuggAddress is the default unix socket address for pprof data