Make "Action not allowed" dialog compliant with Material Spec and replace full screen activities with the dialog.

Bug: 64893948
Test: make ROBOTEST_FILTER=ActionDisabledByAdminDialogTest -j40 RunSettingsRoboTests
Test: make ROBOTEST_FILTER=ActionDisabledByAdminDialogHelperTest -j40 RunSettingsRoboTests
Change-Id: I9308d8d86a3789b8f2c92b9f4f20cf00cce71d14

tests/robotests/src/com/android/settings/testutils/CustomActivity.java

@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2018 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.settings.testutils;
+
+import android.app.Activity;
+import android.content.Intent;
+import android.os.UserHandle;
+
+public class CustomActivity extends Activity {
+    @Override
+    public void startActivityAsUser(Intent intent, UserHandle user) {}
+}