libcontainer/configs: add missing type for hooknames

Commit ccdd75760c introduced the HookName type
for hooks, but only set this type on the Prestart const, but not for the
other hooks.

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

libcontainer/configs/config.go

@@ -222,25 +222,25 @@ const (
 	// the runtime environment has been created but before the pivot_root has been executed.
 	// CreateRuntime is called immediately after the deprecated Prestart hook.
 	// CreateRuntime commands are called in the Runtime Namespace.
-	CreateRuntime = "createRuntime"
+	CreateRuntime HookName = "createRuntime"
 
 	// CreateContainer commands MUST be called as part of the create operation after
 	// the runtime environment has been created but before the pivot_root has been executed.
 	// CreateContainer commands are called in the Container namespace.
-	CreateContainer = "createContainer"
+	CreateContainer HookName = "createContainer"
 
 	// StartContainer commands MUST be called as part of the start operation and before
 	// the container process is started.
 	// StartContainer commands are called in the Container namespace.
-	StartContainer = "startContainer"
+	StartContainer HookName = "startContainer"
 
 	// Poststart commands are executed after the container init process starts.
 	// Poststart commands are called in the Runtime Namespace.
-	Poststart = "poststart"
+	Poststart HookName = "poststart"
 
 	// Poststop commands are executed after the container init process exits.
 	// Poststop commands are called in the Runtime Namespace.
-	Poststop = "poststop"
+	Poststop HookName = "poststop"
 )
 
 type Capabilities struct {