Added HIDL based software implementation of gatekeeper

This patch adds a HIDL based software implementation of gatekeeper based
on libgatekeeper.

Also adds OWNER files to the vts test and default implementation
directories.

Test: Manually tested in emulator. Changing passwords and login worked.
      VtsHalGatekeeperV1_0TargetTest
      gatekeeper-software-device-unit-tests
Change-Id: I632aeb6677640c133ec1b79e72568840adbc0550
diff --git a/gatekeeper/1.0/software/service.cpp b/gatekeeper/1.0/software/service.cpp
new file mode 100644
index 0000000..a48a964
--- /dev/null
+++ b/gatekeeper/1.0/software/service.cpp
@@ -0,0 +1,39 @@
+/*
+ * Copyright (C) 2019 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.
+ */
+#define LOG_TAG "android.hardware.gatekeeper@1.0-service"
+
+#include <android-base/logging.h>
+#include <android/hardware/gatekeeper/1.0/IGatekeeper.h>
+
+#include <hidl/LegacySupport.h>
+
+#include "SoftGateKeeperDevice.h"
+
+// Generated HIDL files
+using android::SoftGateKeeperDevice;
+using android::hardware::gatekeeper::V1_0::IGatekeeper;
+
+int main() {
+    ::android::hardware::configureRpcThreadpool(1, true /* willJoinThreadpool */);
+    android::sp<SoftGateKeeperDevice> gatekeeper(new SoftGateKeeperDevice());
+    auto status = gatekeeper->registerAsService();
+    if (status != android::OK) {
+        LOG(FATAL) << "Could not register service for Gatekeeper 1.0 (software) (" << status << ")";
+    }
+
+    android::hardware::joinRpcThreadpool();
+    return -1;  // Should never get here.
+}