compositor: Rename lock and unlock signals to idle and wake

After the changes introduced in the previous patch, those names are
more appropriate. It is up to the shell to decide when to lock the
screen.
diff --git a/src/shell.c b/src/shell.c
index 8175f9a..ed6f434 100644
--- a/src/shell.c
+++ b/src/shell.c
@@ -83,8 +83,8 @@
 struct desktop_shell {
 	struct weston_compositor *compositor;
 
-	struct wl_listener lock_listener;
-	struct wl_listener unlock_listener;
+	struct wl_listener idle_listener;
+	struct wl_listener wake_listener;
 	struct wl_listener destroy_listener;
 	struct wl_listener show_input_panel_listener;
 	struct wl_listener hide_input_panel_listener;
@@ -2894,20 +2894,20 @@
 }
 
 static void
-lock_handler(struct wl_listener *listener, void *data)
+idle_handler(struct wl_listener *listener, void *data)
 {
 	struct desktop_shell *shell =
-		container_of(listener, struct desktop_shell, lock_listener);
+		container_of(listener, struct desktop_shell, idle_listener);
 
 	shell_fade(shell, FADE_OUT);
 	/* lock() is called from shell_fade_done() */
 }
 
 static void
-unlock_handler(struct wl_listener *listener, void *data)
+wake_handler(struct wl_listener *listener, void *data)
 {
 	struct desktop_shell *shell =
-		container_of(listener, struct desktop_shell, unlock_listener);
+		container_of(listener, struct desktop_shell, wake_listener);
 
 	unlock(shell);
 }
@@ -3965,8 +3965,8 @@
 	if (shell->child.client)
 		wl_client_destroy(shell->child.client);
 
-	wl_list_remove(&shell->lock_listener.link);
-	wl_list_remove(&shell->unlock_listener.link);
+	wl_list_remove(&shell->idle_listener.link);
+	wl_list_remove(&shell->wake_listener.link);
 	wl_list_remove(&shell->show_input_panel_listener.link);
 	wl_list_remove(&shell->hide_input_panel_listener.link);
 
@@ -4070,10 +4070,10 @@
 
 	shell->destroy_listener.notify = shell_destroy;
 	wl_signal_add(&ec->destroy_signal, &shell->destroy_listener);
-	shell->lock_listener.notify = lock_handler;
-	wl_signal_add(&ec->lock_signal, &shell->lock_listener);
-	shell->unlock_listener.notify = unlock_handler;
-	wl_signal_add(&ec->unlock_signal, &shell->unlock_listener);
+	shell->idle_listener.notify = idle_handler;
+	wl_signal_add(&ec->idle_signal, &shell->idle_listener);
+	shell->wake_listener.notify = wake_handler;
+	wl_signal_add(&ec->wake_signal, &shell->wake_listener);
 	shell->show_input_panel_listener.notify = show_input_panels;
 	wl_signal_add(&ec->show_input_panel_signal, &shell->show_input_panel_listener);
 	shell->hide_input_panel_listener.notify = hide_input_panels;