tape: add 'Restore Key' button

src/api2/tape/drive.rs

@@ -1298,6 +1298,11 @@ pub const SUBDIRS: SubdirMap = &sorted!([
         &Router::new()
             .get(&API_METHOD_READ_LABEL)
     ),
+    (
+        "restore-key",
+        &Router::new()
+            .post(&API_METHOD_RESTORE_KEY)
+    ),
     (
         "rewind",
         &Router::new()