[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

data_store/data_provider.cc

@@ -330,10 +330,10 @@ void DataProvider::CleanupThreadMain() {
       WriterMutexLockList locks;
       LockAllMutexes(&locks);
       chunks_updated_ = false;
-      LOG_DEBUG("Starting cache cleanup");
+      LOG_INFO("Starting cache cleanup");
       Stopwatch sw;
       absl::Status status = writer_->Cleanup();
-      LOG_DEBUG("Finished cache cleanup in %0.3f seconds", sw.ElapsedSeconds());
+      LOG_INFO("Finished cache cleanup in %0.3f seconds", sw.ElapsedSeconds());
       next_cleanup_time =
           steady_clock_->Now() + std::chrono::seconds(cleanup_timeout_sec_);
       absl::MutexLock cleaned_lock(&cleaned_mutex_);