[cdc_stream] Fix issues found in tests (#40)

* [cdc_stream] Fix issues found in tests

Fixes a couple of issues found by integration testing:
- Unicode command line args in cdc_stream show up as question marks.
- Log is still named assets_stream_manager instead of cdc_stream.
- An error message contains stadia_assets_stream_manager_v3.exe.
- mount_dir was not the last arg as required by FUSE
- Promoted cache cleanup logs to INFO level since they're important
  for the proper workings of the system.
- Asset streaming cache dir is still %APPDATA%\GGP\asset_streaming.

* Address comments

cdc_stream/multi_session.cc

@@ -625,7 +625,8 @@ absl::StatusOr<std::string> MultiSession::GetCachePath(
   path::Append(&appdata_path, ".cache");
 #endif
 
-  std::string base_dir = path::Join(appdata_path, "GGP", "asset_streaming");
+  std::string base_dir =
+      path::Join(appdata_path, "cdc-file-transfer", "chunks");
   std::string cache_dir = GetCacheDir(src_dir);
 
   size_t total_size = base_dir.size() + 1 + cache_dir.size();