Make locksettings commands go through "cmd lock_settings"

This greatly improves the performance of locksettings commands, and it
eliminates the need for LockSettingsCmd.java.

Bug: 177985929
Test: locksettings command still works
Change-Id: I5881fa074681f6bf1ad2f5969a282d928121ddb2

cmds/locksettings/Android.bp

@@ -21,8 +21,7 @@ package {
     default_applicable_licenses: ["frameworks_base_license"],
 }
 
-java_binary {
+sh_binary {
     name: "locksettings",
-    wrapper: "locksettings.sh",
-    srcs: ["**/*.java"],
+    src: "locksettings.sh",
 }

cmds/locksettings/locksettings.sh

 #!/system/bin/sh
-# Script to start "locksettings" on the device
-#
-base=/system
-export CLASSPATH=$base/framework/locksettings.jar
-exec app_process $base/bin com.android.commands.locksettings.LockSettingsCmd "$@"
+cmd lock_settings "$@"

cmds/locksettings/src/com/android/commands/locksettings/LockSettingsCmd.java

-/*
- * Copyright (C) 2016 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
- */
-
-package com.android.commands.locksettings;
-
-import android.os.ResultReceiver;
-import android.os.ServiceManager;
-import android.os.ShellCallback;
-
-import com.android.internal.os.BaseCommand;
-import com.android.internal.widget.ILockSettings;
-
-import java.io.FileDescriptor;
-import java.io.PrintStream;
-
-public final class LockSettingsCmd extends BaseCommand {
-
-    public static void main(String[] args) {
-        (new LockSettingsCmd()).run(args);
-    }
-
-    @Override
-    public void onShowUsage(PrintStream out) {
-        main(new String[] { "help" });
-    }
-
-    @Override
-    public void onRun() throws Exception {
-        ILockSettings lockSettings = ILockSettings.Stub.asInterface(
-                ServiceManager.getService("lock_settings"));
-        lockSettings.asBinder().shellCommand(FileDescriptor.in, FileDescriptor.out,
-                FileDescriptor.err, getRawArgs(), new ShellCallback(), new ResultReceiver(null) {});
-    }
-}