Secretkeeper: improve VTS tests

- Look for either /default or /nonsecure instances.
- Only run a `deleteAll()` test on a /nonsecure instance.
- Delete IDs on client drop to ensure a consistent state.
- Use a config that ensures tests are run single-threaded, to ensure a
  consistent state.
- Shift to using types not raw arrays.
- Add a macro for common test setup.
- Add helper methods to reduce the amount of copy-pasta in the VTS
  tests.
- Use these helpers to create some additional tests.

Test: VtsSecretkeeperTargetTest
Bug: 291224769
Change-Id: Icff0bba1bcdd66b18398ed4b64ebd2c6bc0de7e7
diff --git a/security/secretkeeper/aidl/vts/AndroidTest.xml b/security/secretkeeper/aidl/vts/AndroidTest.xml
new file mode 100644
index 0000000..4fee78f
--- /dev/null
+++ b/security/secretkeeper/aidl/vts/AndroidTest.xml
@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2023 The Android Open Source Project
+
+     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.
+-->
+<configuration description="Config for Secretkeeper VTS tests.">
+  <target_preparer class="com.android.tradefed.targetprep.RootTargetPreparer"/>
+
+  <target_preparer class="com.android.tradefed.targetprep.PushFilePreparer">
+    <option name="push-file" key="VtsSecretkeeperTargetTest" value="/data/local/tmp/VtsSecretkeeperTargetTest" />
+  </target_preparer>
+
+  <test class="com.android.tradefed.testtype.rust.RustBinaryTest" >
+    <option name="test-device-path" value="/data/local/tmp" />
+    <option name="module-name" value="VtsSecretkeeperTargetTest" />
+    <!-- Rust tests are run in parallel by default. Run these ones
+         single-threaded, so that one test's secrets don't affect
+         the behaviour of a different test. -->
+    <option name="native-test-flag" value="--test-threads=1" />
+  </test>
+</configuration>