libcontainer: expose annotations in hooks

Annotations weren't passed to hooks. This patch fixes that by passing
annotations to stdin for hooks.

Signed-off-by: Antonio Murdaca <runcom@redhat.com>

libcontainer/state_linux.go

@@ -63,10 +63,12 @@ func destroy(c *linuxContainer) error {
 
 func runPoststopHooks(c *linuxContainer) error {
 	if c.config.Hooks != nil {
+		bundle, annotations := utils.Annotations(c.config.Labels)
 		s := configs.HookState{
-			Version: c.config.Version,
-			ID:      c.id,
-			Bundle:  utils.SearchLabels(c.config.Labels, "bundle"),
+			Version:     c.config.Version,
+			ID:          c.id,
+			Bundle:      bundle,
+			Annotations: annotations,
 		}
 		for _, hook := range c.config.Hooks.Poststop {
 			if err := hook.Run(s); err != nil {