Delete old secretstore, cmd/node and config modules

This removes even more code that is no longer necessary or interferes with new concepts. It also refactors the storage stuff into a StorageManager which deals with all the paths and async initialization.

This does intentionally break a few things which will be fixed when the CA code lands.

Test Plan: Manually tested using make launch, CI is in a separate ticket

X-Origin-Diff: phab/D182
GitOrigin-RevId: 282a4bd84b47010d859e03da53b2c2de8183b13b
diff --git a/internal/storage/xfs.go b/internal/storage/xfs.go
new file mode 100644
index 0000000..30c6686
--- /dev/null
+++ b/internal/storage/xfs.go
@@ -0,0 +1,18 @@
+// Copyright 2020 The Monogon Project Authors.
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package storage
+