More robust app data and user data removal.

1. rename the folder, so any new files will end up in the renamed
   folder.
   this also greatly reduces chances that app will be able to create new files.
2. delete the renamed folder
3. provide an api to cleanup renamed/deleted folders on system startup

Bug: 162757029
Test: atest installd_service_test installd_cache_test installd_utils_test installd_dexopt_test installd_otapreopt_test installd_file_test
Change-Id: If1c209d49675f7fa9df60b6136588e3b0a7786e5