Extracted some logic to utils_default.cpp in order to make platform specific overriding easier

Test: manual - could install and remove an app. As this is
refactoring there is no need for automated tests.

Change-Id: Ia9321de6699c69fbb7cfa9cf43edde102d56d532
diff --git a/cmds/installd/utils_default.cpp b/cmds/installd/utils_default.cpp
new file mode 100644
index 0000000..a6025e6
--- /dev/null
+++ b/cmds/installd/utils_default.cpp
@@ -0,0 +1,30 @@
+/*
+** Copyright 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.
+*/
+
+#include "utils.h"
+
+namespace android {
+namespace installd {
+
+// In this file are default definitions of the functions that may contain
+// platform dependent logic.
+
+int rm_package_dir(const std::string& package_dir) {
+    return delete_dir_contents_and_dir(package_dir);
+}
+
+}  // namespace installd
+}  // namespace android